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<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>Chapter2.Small Office Networking</title><link rel="stylesheet" href="../samba.css" type="text/css"><meta name="generator" content="DocBook XSL Stylesheets V1.75.2"><link rel="home" href="index.html" title="Samba-3 by Example"><link rel="up" href="ExNetworks.html" title="PartI.Example Network Configurations"><link rel="prev" href="simple.html" title="Chapter1.No-Frills Samba Servers"><link rel="next" href="secure.html" title="Chapter3.Secure Office Networking"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter2.Small Office Networking</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="simple.html">Prev</a></td><th width="60%" align="center">PartI.Example Network Configurations</th><td width="20%" align="right"><a accesskey="n" href="secure.html">Next</a></td></tr></table><hr></div><div class="chapter" title="Chapter2.Small Office Networking"><div class="titlepage"><div><div><h2 class="title"><a name="small"></a>Chapter2.Small Office Networking</h2></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl><dt><span class="sect1"><a href="small.html#id327308">Introduction</a></span></dt><dd><dl><dt><span class="sect2"><a href="small.html#id327326">Assignment Tasks</a></span></dt></dl></dd><dt><span class="sect1"><a href="small.html#id327371">Dissection and Discussion</a></span></dt><dd><dl><dt><span class="sect2"><a href="small.html#id327416">Technical Issues</a></span></dt><dt><span class="sect2"><a href="small.html#id327588">Political Issues</a></span></dt></dl></dd><dt><span class="sect1"><a href="small.html#id327606">Implementation</a></span></dt><dd><dl><dt><span class="sect2"><a href="small.html#id329058">Validation</a></span></dt><dt><span class="sect2"><a href="small.html#id329633">Notebook Computers: A Special Case</a></span></dt><dt><span class="sect2"><a href="small.html#id329652">Key Points Learned</a></span></dt></dl></dd><dt><span class="sect1"><a href="small.html#id329716">Questions and Answers</a></span></dt></dl></div><p>
	<a class="link" href="simple.html" title="Chapter1.No-Frills Samba Servers">&#8220;No-Frills Samba Servers&#8221;</a> focused on the basics of simple yet effective
	network solutions. Network administrators who take pride in their work
	(that's most of us, right?) take care to deliver what our users want,
	but not too much more. If we make things too complex, we confound our users
	and increase costs of network ownership. A professional network manager
	avoids the temptation to put too much pizazz into the way that the network
	operates. Some creativity is helpful, but keep it under control 
	good advice that the following two scenarios illustrate.
	</p><p>
	<a class="indexterm" name="id327280"></a>
	In one case the network administrator of a mid-sized company spent three
	months building a new network to replace an old Netware server. What he
	delivered had all the bells and whistles he could muster. There were a
	few teething problems during the changeover, nothing serious but a little
	disruptive all the same. Users were exposed to many changes at once. The
	network administrator was asked to resign two months after implementing
	the new system because so many staff complained they had lost time and
	were not happy with the new network.  Everything was automated, and he
	delivered more features than any advanced user could think of. He was
	just too smart for his own good.
	</p><p>
	In the case of the other company, a new network manager was appointed
	to oversee the replacement of a LanTastic network with an MS Windows
	NT 4.0 network. He had the replacement installed and operational within
	two weeks. Before installation and changeover, he called a meeting to
	explain to all users what was going to happen, how it would affect them,
	and that he would be available 24 hours a day to help them transition.
	One week after conversion, he held another meeting asking for cooperation
	in the introduction of a few new features that would help to make life
	easier. Network users were thrilled with the help he provided. The network
	he implemented was nowhere near as complex as in the first example, had fewer
	features, and yet he had happy users. Months later he was still adding
	new innovations. He always asked the users if a
	particular feature was what they wanted. He asked his boss for a raise
	and got it. He often told me, <span class="quote">&#8220;<span class="quote">Always keep a few new tricks up your
	sleeves for when you need them.</span>&#8221;</span> Was he smart? You decide. Let's
	get on with our next exercise.
	</p><div class="sect1" title="Introduction"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id327308"></a>Introduction</h2></div></div></div><p>
	Abmas Accounting has grown. Mr. Meany likes you and says he knew you
	were the right person for the job. That's why he asked you to install the
	new server. The past few months have been hard work. You advised Mr. Meany
	that it is time for a change. Abmas now has 52 users, having acquired an
	investment consulting business recently. The new users were added to the
	network without any problems.
	</p><p>
	Some of the Windows clients are nearly past their use-by date.  You found damaged and unusable software on
	some of the workstations that came with the acquired business and found some machines in need of both
	hardware and software maintenance.
	</p><div class="sect2" title="Assignment Tasks"><div class="titlepage"><div><div><h3 class="title"><a name="id327326"></a>Assignment Tasks</h3></div></div></div><p>
		<a class="indexterm" name="id327333"></a>
		Mr. Meany is retiring in 12 months. Before he goes, he wants you to help ensure
		that the business is running efficiently. Many of the new staff want notebook
		computers.  They visit customer business premises and need to use local network
		facilities; these users are technically competent. The company uses a
		business application that requires Windows XP Professional. In short, a complete
		client upgrade is about to happen. Mr. Meany told you that he is working
		on another business acquisition and that by the time he retires there will be
		80 to 100 users.
		</p><p>
		Mr. Meany is not concerned about security. He wants to make it easier for
		staff to do their work. He has hired you to help him appoint a full-time
		network manager before he retires. Above all, he says he is investing in
		the ability to grow. He is determined to live his lifelong dream and
		hand the business over to a bright and capable executive who can make
		things happen. This means your network design must cope well with
		growth.
		</p><p>
		In a few months, Abmas will require an Internet connection for email and so
		that staff can easily obtain software updates. Mr. Meany is warming up to
		the installation of antivirus software but is not yet ready to approve
		this expense. He told you to spend the money a virus scanner costs
		on better quality notebook computers for mobile users.
		</p><p>
		One of Mr. Meany's golfing partners convinced him to buy new laser
		printers, one black only, the other a color laser printer. Staff support
		the need for a color printer so they can present more attractive proposals
		and reports.
		</p><p>
		Mr. Meany also asked if it would be possible for one of the staff to manage
		user accounts from the Windows desktop. That person will be responsible for
		basic operations.
		</p></div></div><div class="sect1" title="Dissection and Discussion"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id327371"></a>Dissection and Discussion</h2></div></div></div><p>
	What are the key requirements in this business example? A quick review indicates
	a need for
	</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>
		Scalability, from 52 to over 100 users in 12 months
		</p></li><li class="listitem"><p>
		Mobile computing capability
		<a class="indexterm" name="id327391"></a>
		</p></li><li class="listitem"><p>
		Improved reliability and usability
		</p></li><li class="listitem"><p>
		Easier administration
		</p></li></ul></div><p>
	In this instance the installed Linux system is assumed to be a Red Hat Linux Fedora Core2 server
	(as in <a class="link" href="simple.html#AccountingOffice" title="Accounting Office">&#8220;Accounting Office&#8221;</a>).

	</p><div class="sect2" title="Technical Issues"><div class="titlepage"><div><div><h3 class="title"><a name="id327416"></a>Technical Issues</h3></div></div></div><p>
		<a class="indexterm" name="id327424"></a>
		<a class="indexterm" name="id327430"></a>
		<a class="indexterm" name="id327436"></a>
		<a class="indexterm" name="id327443"></a>
		<a class="indexterm" name="id327449"></a>
		It is time to implement a domain security environment. You will use the <code class="constant">
		smbpasswd</code> (default) backend. You should implement a DHCP server. There is no need to
		run DNS at this time, but the system will use WINS. The domain name will be <code class="constant">
		BILLMORE</code>. This time, the name of the server will be <code class="constant">SLEETH</code>.
		</p><p>
		All printers will be configured as DHCP clients. The DHCP server will assign
		the printer a fixed IP address by way of its Ethernet interface (MAC) address.
		See <a class="link" href="small.html#dhcp01" title="Example2.2.Abmas Accounting DHCP Server Configuration File /etc/dhcpd.conf">&#8220;Abmas Accounting DHCP Server Configuration File  /etc/dhcpd.conf&#8221;</a>.
                </p><div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3><p>
		The <code class="filename">smb.conf</code> file you are creating in this exercise can be used with equal effectiveness
		with Samba-2.2.x series releases. This is deliberate so that in the next chapter it is
		possible to start with the installation that you have created here, migrate it
		to a Samba-3 configuration, and then secure the system further. Configurations following
		this one utilize features that may not be supported in Samba-2.2.x releases.
		However, you should note that the examples in each chapter start with the assumption
		that a fresh new installation is being effected.
		</p></div><p>
		Later on, when the Internet connection is implemented, you will add DNS as well as
		other enhancements. It is important that you plan accordingly.
		</p><p>
		<a class="indexterm" name="id327498"></a>
		You have split the network into two separate areas. Each has its own Ethernet switch.
		There are 20 users on the accounting network and 32 users on the financial services
		network. The server has two network interfaces, one serving each network. The
		network printers will be located in a central area. You plan to install the new
		printers and keep the old printer in use also.
		</p><p>
		You will provide separate file storage areas for each business entity. The old system
		will go away, accounting files will be handled under a single directory, and files will
		be stored under customer name, not under a personal work area. Staff will be made
		responsible for file location, so the old share point must be maintained.
		</p><p>
		Given that DNS will not be used, you will configure WINS name resolution for UNIX
		hostname name resolution.
		</p><p>
		<a class="indexterm" name="id327521"></a>
		<a class="indexterm" name="id327530"></a>
		It is necessary to map Windows Domain Groups to UNIX groups. It is
		advisable to also map Windows Local Groups to UNIX groups. Additionally, the two
		key staff groups in the firm are accounting staff and financial services staff.
		For these, it is necessary to create UNIX groups as well as Windows Domain Groups.
		</p><p>
		In the sample <code class="filename">smb.conf</code> file, you have configured Samba to call the UNIX
		<code class="literal">groupadd</code> to add group entries. This utility does not permit
		the addition of group names that contain uppercase characters or spaces. This
		is considered a bug. The <code class="literal">groupadd</code> is part of the
		<code class="literal">shadow-utils</code> open source software package.  A later release
		of this package may have been patched to resolve this bug.  If your operating
		platform has this bug, it means that attempts to add a Windows Domain Group that
		has either a space or uppercase characters in it will fail. See
		<span class="emphasis"><em>TOSHARG2</em></span>, Chapter 11, Section 11.3.1, Example 11.1, for
		more information.
		</p><p>
		<a class="indexterm" name="id327576"></a>
		Vendor-supplied printer drivers will be installed on each client. The CUPS print
		spooler on the UNIX host will be operated in <code class="constant">raw</code> mode.
		</p></div><div class="sect2" title="Political Issues"><div class="titlepage"><div><div><h3 class="title"><a name="id327588"></a>Political Issues</h3></div></div></div><p>
		Mr. Meany is an old-school manager. He sets the rules and wants to see compliance.
		He is willing to spend money on things he believes are of value. You need more
		time to convince him of real priorities.
		</p><p>
		Go ahead, buy better notebooks. Wouldn't it be neat if they happened to be
		supplied with antivirus software? Above all, demonstrate good purchase value and remember
		to make your users happy.
		</p></div></div><div class="sect1" title="Implementation"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id327606"></a>Implementation</h2></div></div></div><p>
	<a class="indexterm" name="id327614"></a>
	In this example, the assumption is made that this server is being configured from a clean start.
	The alternate approach could be to demonstrate the migration of the system that is documented
	in <a class="link" href="simple.html#AcctgNet" title="Implementation">&#8220;Implementation&#8221;</a> to meet the new requirements. The decision to treat this case, as with
	future examples, as a new installation is based on the premise that you can determine
	the migration steps from the information provided in <a class="link" href="ntmigration.html" title="Chapter9.Migrating NT4 Domain to Samba-3">&#8220;Migrating NT4 Domain to Samba-3&#8221;</a>.
	Additionally, a fresh installation makes the example easier to follow.
	</p><p>
	<a class="indexterm" name="id327636"></a>
	Each user will be given a home directory on the UNIX system, which will be available as a private
	share. Two additional shares will be created, one for the accounting department and the other for
	the financial services department. Network users will be given access to these shares by way
	of group membership.
	</p><p>
	<a class="indexterm" name="id327648"></a>
	UNIX group membership is the primary mechanism by which Windows Domain users will be granted
	rights and privileges within the Windows environment.
	</p><p>
	<a class="indexterm" name="id327661"></a>
	The user <code class="literal">alanm</code> will be made the owner of all files. This will be preserved
	by setting the sticky bit (set UID/GID) on the top-level directories.
	</p><p>
	</p><div class="figure"><a name="acct2net"></a><p class="title"><b>Figure2.1.Abmas Accounting  52-User Network Topology</b></p><div class="figure-contents"><div class="mediaobject"><img src="images/acct2net.png" alt="Abmas Accounting 52-User Network Topology"></div></div></div><p><br class="figure-break">
</p><div class="procedure" title="Procedure2.1.Server Installation Steps"><a name="id327717"></a><p class="title"><b>Procedure2.1.Server Installation Steps</b></p><ol class="procedure" type="1"><li class="step" title="Step 1"><p>
		Using UNIX/Linux system tools, name the server <code class="constant">sleeth</code>.
		</p></li><li class="step" title="Step 2"><p>
		<a class="indexterm" name="id327737"></a>
		Place an entry for the machine <code class="constant">sleeth</code> in the <code class="filename">/etc/hosts</code>.
		The printers are network attached, so there should be entries for the
		network printers also. An example <code class="filename">/etc/hosts</code> file is shown here:
</p><pre class="screen">
192.168.1.1     sleeth sleeth1
192.168.2.1     sleeth2
192.168.1.10    hplj6
192.168.1.11    hplj4
192.168.2.10    qms
</pre><p>
		</p></li><li class="step" title="Step 3"><p>
		Install the Samba-3 binary RPM from the Samba-Team FTP site.
		</p></li><li class="step" title="Step 4"><p>
		Install the ISC DHCP server using the UNIX/Linux system tools available to you.
		</p></li><li class="step" title="Step 5"><p>
		<a class="indexterm" name="id327784"></a>
		<a class="indexterm" name="id327791"></a>
		<a class="indexterm" name="id327797"></a>
		<a class="indexterm" name="id327803"></a>
		Because Samba will be operating over two network interfaces and clients on each side
		may want to be able to reach clients on the other side, it is imperative that IP forwarding
		is enabled. Use the system tool of your choice to enable IP forwarding. In the
		absence of such a tool on the Linux system, add to the <code class="filename">/etc/rc.d/rc.local</code>
		file an entry as follows:
</p><pre class="screen">
echo 1 &gt; /proc/sys/net/ipv4/ip_forward
</pre><p>
		This causes the Linux kernel to forward IP packets so that it acts as a router.
		</p></li><li class="step" title="Step 6"><p>
		Install the <code class="filename">smb.conf</code> file as shown in <a class="link" href="small.html#acct2conf" title="Example2.3.Accounting Office Network smb.conf File [globals] Section">&#8220;Accounting Office Network smb.conf File  [globals] Section&#8221;</a> and
		<a class="link" href="small.html#acct3conf" title="Example2.4.Accounting Office Network smb.conf File Services and Shares Section">&#8220;Accounting Office Network smb.conf File  Services and Shares Section&#8221;</a>. Combine these two examples to form a single
		<code class="filename">/etc/samba/smb.conf</code> file.
		</p></li><li class="step" title="Step 7"><p>
		<a class="indexterm" name="id327856"></a>
		Add the user <code class="literal">root</code> to the Samba password backend:
</p><pre class="screen">
<code class="prompt">root# </code> smbpasswd -a root
New SMB password: XXXXXXX
Retype new SMB password: XXXXXXX
<code class="prompt">root# </code>
</pre><p>
		<a class="indexterm" name="id327884"></a>
		This is the Windows Domain Administrator password. Never delete this account from
		the password backend after Windows Domain Groups have been initialized. If you delete
		this account, your system is crippled. You cannot restore this account,
		and your Samba server can no longer be administered.
		</p></li><li class="step" title="Step 8"><p>
		<a class="indexterm" name="id327899"></a>
		Create the username map file to permit the <code class="constant">root</code> account to be called
		<code class="constant">Administrator</code> from the Windows network environment. To do this, create
		the file <code class="filename">/etc/samba/smbusers</code> with the following contents:
</p><pre class="screen">
####
# User mapping file
####
# File Format
# -----------
# Unix_ID = Windows_ID
#
# Examples:
# root = Administrator
# janes = "Jane Smith"
# jimbo = Jim Bones
#
# Note: If the name contains a space it must be double quoted.
#       In the example above the name 'jimbo' will be mapped to Windows
#       user names 'Jim' and 'Bones' because the space was not quoted.
#######################################################################
root = Administrator
####
# End of File
####
</pre><p>
		</p></li><li class="step" title="Step 9"><p>
		<a class="indexterm" name="id327933"></a>
		Create and map Windows Domain Groups to UNIX groups. A sample script is provided in
		<a class="link" href="small.html#initGrps" title="Example2.1.Script to Map Windows NT Groups to UNIX Groups">&#8220;Script to Map Windows NT Groups to UNIX Groups&#8221;</a>. Create a file containing this script. We called ours
		<code class="filename">/etc/samba/initGrps.sh</code>. Set this file so it can be executed,
		and then execute the script. Sample output should be as follows:

</p><div class="example"><a name="initGrps"></a><p class="title"><b>Example2.1.Script to Map Windows NT Groups to UNIX Groups</b></p><div class="example-contents"><a class="indexterm" name="id327958"></a><pre class="screen">
#!/bin/bash
#
# initGrps.sh
#

# Create UNIX groups
groupadd acctsdep
groupadd finsrvcs

# Map Windows Domain Groups to UNIX groups
net groupmap add ntgroup="Domain Admins"  unixgroup=root type=d
net groupmap add ntgroup="Domain Users"   unixgroup=users type=d
net groupmap add ntgroup="Domain Guests"  unixgroup=nobody type=d

# Add Functional Domain Groups
net groupmap add ntgroup="Accounts Dept"  unixgroup=acctsdep type=d
net groupmap add ntgroup="Financial Services" unixgroup=finsrvcs type=d
</pre></div></div><p><br class="example-break">

</p><pre class="screen">
<code class="prompt">root# </code> chmod 755 initGrps.sh
<code class="prompt">root# </code> cd /etc/samba
<code class="prompt">root# </code> ./initGrps.sh
Updated mapping entry for Domain Admins
Updated mapping entry for Domain Users
Updated mapping entry for Domain Guests
No rid or sid specified, choosing algorithmic mapping
Successfully added group Accounts Dept to the mapping db
No rid or sid specified, choosing algorithmic mapping
Successfully added group Domain Guests to the mapping db

<code class="prompt">root# </code> cd /etc/samba
<code class="prompt">root# </code> net groupmap list | sort
Account Operators (S-1-5-32-548) -&gt; -1
Accounts Dept (S-1-5-21-194350-25496802-3394589-2003) -&gt; acctsdep
Administrators (S-1-5-32-544) -&gt; -1
Backup Operators (S-1-5-32-551) -&gt; -1
Domain Admins (S-1-5-21-194350-25496802-3394589-512) -&gt; root
Domain Guests (S-1-5-21-194350-25496802-3394589-514) -&gt; nobody
Domain Users (S-1-5-21-194350-25496802-3394589-513) -&gt; users
Financial Services (S-1-5-21-194350-25496802-3394589-2005) -&gt; finsrvcs
Guests (S-1-5-32-546) -&gt; -1
Power Users (S-1-5-32-547) -&gt; -1
Print Operators (S-1-5-32-550) -&gt; -1
Replicators (S-1-5-32-552) -&gt; -1
System Operators (S-1-5-32-549) -&gt; -1
Users (S-1-5-32-545) -&gt; -1
</pre><p>
		</p></li><li class="step" title="Step 10"><p>
		<a class="indexterm" name="id328022"></a>
		<a class="indexterm" name="id328029"></a>
		<a class="indexterm" name="id328037"></a>
		For each user who needs to be given a Windows Domain account, make an entry in the
		<code class="filename">/etc/passwd</code> file as well as in the Samba password backend.
		Use the system tool of your choice to create the UNIX system accounts, and use the Samba
		<code class="literal">smbpasswd</code> program to create the Domain user accounts.
		</p><p>
		<a class="indexterm" name="id328059"></a>
		<a class="indexterm" name="id328066"></a>
		<a class="indexterm" name="id328072"></a>
		There are a number of tools for user management under UNIX, such as
		<code class="literal">useradd</code> and <code class="literal">adduser</code>, as well as a plethora of custom
		tools. With the tool of your choice, create a home directory for each user.
		</p></li><li class="step" title="Step 11"><p>
		Using the preferred tool for your UNIX system, add each user to the UNIX groups created
		previously, as necessary. File system access control will be based on UNIX group membership.
		</p></li><li class="step" title="Step 12"><p>
		Create the directory mount point for the disk subsystem that is mounted to provide
		data storage for company files. In this case the mount point is indicated in the <code class="filename">smb.conf</code>
		file is <code class="filename">/data</code>. Format the file system as required, mount the formatted
		file system partition using <code class="literal">mount</code>,
		and make the appropriate changes in <code class="filename">/etc/fstab</code>.
		</p></li><li class="step" title="Step 13"><p>
		Create the top-level file storage directories are follows:
</p><pre class="screen">
<code class="prompt">root# </code> mkdir -p /data/{accounts,finsvcs}
<code class="prompt">root# </code> chown -R root:root /data
<code class="prompt">root# </code> chown -R alanm:acctsdep /data/accounts
<code class="prompt">root# </code> chown -R alanm:finsrvcs /data/finsrvcs
<code class="prompt">root# </code> chmod -R ug+rwx,o+rx-w /data
</pre><p>
		Each department is responsible for creating its own directory structure within its
		share. The directory root of the <code class="literal">accounts</code> share is <code class="filename">/data/accounts</code>.
		The directory root of the <code class="literal">finsvcs</code> share is <code class="filename">/data/finsvcs</code>.
		</p></li><li class="step" title="Step 14"><p>
		Configure the printers with the IP addresses as shown in <a class="link" href="small.html#acct2net" title="Figure2.1.Abmas Accounting 52-User Network Topology">&#8220;Abmas Accounting  52-User Network Topology&#8221;</a>.
		Follow the instructions in the manufacturers' manuals to permit printing to port 9100.
		This allows the CUPS spooler to print using raw mode protocols.
		<a class="indexterm" name="id328203"></a>
		<a class="indexterm" name="id328209"></a>
		</p></li><li class="step" title="Step 15"><p>
		<a class="indexterm" name="id328222"></a>
		<a class="indexterm" name="id328230"></a>
		Configure the CUPS Print Queues as follows:
</p><pre class="screen">
<code class="prompt">root# </code> lpadmin -p hplj4 -v socket://192.168.1.11:9100 -E
<code class="prompt">root# </code> lpadmin -p hplj6 -v socket://192.168.1.10:9100 -E
<code class="prompt">root# </code> lpadmin -p qms -v socket://192.168.2.10:9100 -E
</pre><p>
		<a class="indexterm" name="id328257"></a>
		This creates the necessary print queues with no assigned print filter.
		</p></li><li class="step" title="Step 16"><p>
		<a class="indexterm" name="id328270"></a>
		<a class="indexterm" name="id328277"></a>
		<a class="indexterm" name="id328283"></a>
		Edit the file <code class="filename">/etc/cups/mime.convs</code> to uncomment the line:
</p><pre class="screen">
application/octet-stream     application/vnd.cups-raw      0     -
</pre><p>
		</p></li><li class="step" title="Step 17"><p>
		<a class="indexterm" name="id328306"></a>
		Edit the file <code class="filename">/etc/cups/mime.types</code> to uncomment the line:
</p><pre class="screen">
application/octet-stream
</pre><p>
		</p></li><li class="step" title="Step 18"><p>
		<a class="indexterm" name="id328329"></a>
		Using your favorite system editor, create an <code class="filename">/etc/dhcpd.conf</code> with the
		contents as shown in <a class="link" href="small.html#dhcp01" title="Example2.2.Abmas Accounting DHCP Server Configuration File /etc/dhcpd.conf">&#8220;Abmas Accounting DHCP Server Configuration File  /etc/dhcpd.conf&#8221;</a>.
</p><div class="example"><a name="dhcp01"></a><p class="title"><b>Example2.2.Abmas Accounting DHCP Server Configuration File  <code class="filename">/etc/dhcpd.conf</code></b></p><div class="example-contents"><a class="indexterm" name="id328359"></a><pre class="screen">
default-lease-time 86400;
max-lease-time 172800;
default-lease-time 86400;

option ntp-servers 192.168.1.1;
option domain-name "abmas.biz";
option domain-name-servers 192.168.1.1, 192.168.2.1;
option netbios-name-servers 192.168.1.1, 192.168.2.1;
option netbios-node-type 8;
### NOTE ###
# netbios-node-type=8 means set clients to Hybrid Mode
#   so they will use Unicast communication with the WINS
#   server and thus reduce the level of UDP broadcast
#   traffic by up to 90%.
############

subnet 192.168.1.0 netmask 255.255.255.0 {
	range dynamic-bootp 192.168.1.128 192.168.1.254;
	option subnet-mask 255.255.255.0;
	option routers 192.168.1.1;
	allow unknown-clients;
	host hplj4 {
		hardware ethernet 08:00:46:7a:35:e4;
		fixed-address 192.168.1.10;
		}
	host hplj6 {
		hardware ethernet 00:03:47:cb:81:e0;
		fixed-address 192.168.1.11;
		}
	}
subnet 192.168.2.0 netmask 255.255.255.0 {
	range dynamic-bootp 192.168.2.128 192.168.2.254;
	option subnet-mask 255.255.255.0;
	option routers 192.168.2.1;
	allow unknown-clients;
	host qms {
		hardware ethernet 01:04:31:db:e1:c0;
		fixed-address 192.168.1.10;
		}
	}
subnet 127.0.0.0 netmask 255.0.0.0 {
	}
</pre></div></div><p><br class="example-break">
		</p></li><li class="step" title="Step 19"><p>
		Use the standard system tool to start Samba and CUPS and configure them to start
		automatically at every system reboot. For example,
		</p><p>
		<a class="indexterm" name="id328392"></a>
		<a class="indexterm" name="id328398"></a>
		<a class="indexterm" name="id328404"></a>
		<a class="indexterm" name="id328411"></a>
		<a class="indexterm" name="id328417"></a>
</p><pre class="screen">
<code class="prompt">root# </code> chkconfig dhcp on
<code class="prompt">root# </code> chkconfig smb on
<code class="prompt">root# </code> chkconfig cups on
<code class="prompt">root# </code> /etc/rc.d/init.d/dhcp restart
<code class="prompt">root# </code> /etc/rc.d/init.d/smb restart
<code class="prompt">root# </code> /etc/rc.d/init.d/cups restart
</pre><p>
		</p></li><li class="step" title="Step 20"><p>
		<a class="indexterm" name="id328466"></a>
		<a class="indexterm" name="id328472"></a>
		<a class="indexterm" name="id328480"></a>
		<a class="indexterm" name="id328487"></a>
		<a class="indexterm" name="id328493"></a>
		<a class="indexterm" name="id328499"></a>
		Configure the name service switch (NSS) to handle WINS-based name resolution.
		Since this system does not use a DNS server, it is safe to remove this option from
		the NSS configuration. Edit the <code class="filename">/etc/nsswitch.conf</code> file so that
		the <code class="constant">hosts:</code> entry looks like this:
</p><pre class="screen">
hosts:	files wins
</pre><p>
		</p></li></ol></div><div class="example"><a name="acct2conf"></a><p class="title"><b>Example2.3.Accounting Office Network <code class="filename">smb.conf</code> File  [globals] Section</b></p><div class="example-contents"><table border="0" summary="Simple list" class="simplelist"><tr><td># Global parameters</td></tr><tr><td> </td></tr><tr><td><em class="parameter"><code>[global]</code></em></td></tr><tr><td><a class="indexterm" name="id328555"></a><em class="parameter"><code>workgroup = BILLMORE</code></em></td></tr><tr><td><a class="indexterm" name="id328565"></a><em class="parameter"><code>passwd chat = *New*Password* %n\n*Re-enter*new*password* %n\n *Password*changed*</code></em></td></tr><tr><td><a class="indexterm" name="id328576"></a><em class="parameter"><code>username map = /etc/samba/smbusers</code></em></td></tr><tr><td><a class="indexterm" name="id328587"></a><em class="parameter"><code>syslog = 0</code></em></td></tr><tr><td><a class="indexterm" name="id328597"></a><em class="parameter"><code>name resolve order = wins bcast hosts</code></em></td></tr><tr><td><a class="indexterm" name="id328607"></a><em class="parameter"><code>printcap name = CUPS</code></em></td></tr><tr><td><a class="indexterm" name="id328618"></a><em class="parameter"><code>show add printer wizard = No</code></em></td></tr><tr><td><a class="indexterm" name="id328628"></a><em class="parameter"><code>add user script = /usr/sbin/useradd -m -G users '%u'</code></em></td></tr><tr><td><a class="indexterm" name="id328639"></a><em class="parameter"><code>delete user script = /usr/sbin/userdel -r '%u'</code></em></td></tr><tr><td><a class="indexterm" name="id328649"></a><em class="parameter"><code>add group script = /usr/sbin/groupadd '%g'</code></em></td></tr><tr><td><a class="indexterm" name="id328659"></a><em class="parameter"><code>delete group script = /usr/sbin/groupdel '%g'</code></em></td></tr><tr><td><a class="indexterm" name="id328670"></a><em class="parameter"><code>add user to group script = /usr/sbin/usermod -A '%g' '%u'</code></em></td></tr><tr><td><a class="indexterm" name="id328681"></a><em class="parameter"><code>add machine script = /usr/sbin/useradd -s /bin/false -d /var/lib/nobody '%u'</code></em></td></tr><tr><td><a class="indexterm" name="id328692"></a><em class="parameter"><code>logon script = scripts\login.bat</code></em></td></tr><tr><td><a class="indexterm" name="id328702"></a><em class="parameter"><code>logon path =  </code></em></td></tr><tr><td><a class="indexterm" name="id328713"></a><em class="parameter"><code>logon drive = X:</code></em></td></tr><tr><td><a class="indexterm" name="id328723"></a><em class="parameter"><code>domain logons = Yes</code></em></td></tr><tr><td><a class="indexterm" name="id328734"></a><em class="parameter"><code>preferred master = Yes</code></em></td></tr><tr><td><a class="indexterm" name="id328744"></a><em class="parameter"><code>wins support = Yes</code></em></td></tr><tr><td><a class="indexterm" name="id328754"></a><em class="parameter"><code>printing = CUPS</code></em></td></tr></table></div></div><br class="example-break"><div class="example"><a name="acct3conf"></a><p class="title"><b>Example2.4.Accounting Office Network <code class="filename">smb.conf</code> File  Services and Shares Section</b></p><div class="example-contents"><table border="0" summary="Simple list" class="simplelist"><tr><td> </td></tr><tr><td><em class="parameter"><code>[homes]</code></em></td></tr><tr><td><a class="indexterm" name="id328794"></a><em class="parameter"><code>comment = Home Directories</code></em></td></tr><tr><td><a class="indexterm" name="id328805"></a><em class="parameter"><code>valid users = %S</code></em></td></tr><tr><td><a class="indexterm" name="id328815"></a><em class="parameter"><code>read only = No</code></em></td></tr><tr><td><a class="indexterm" name="id328825"></a><em class="parameter"><code>browseable = No</code></em></td></tr><tr><td> </td></tr><tr><td><em class="parameter"><code>[printers]</code></em></td></tr><tr><td><a class="indexterm" name="id328844"></a><em class="parameter"><code>comment = SMB Print Spool</code></em></td></tr><tr><td><a class="indexterm" name="id328855"></a><em class="parameter"><code>path = /var/spool/samba</code></em></td></tr><tr><td><a class="indexterm" name="id328865"></a><em class="parameter"><code>printable = Yes</code></em></td></tr><tr><td><a class="indexterm" name="id328875"></a><em class="parameter"><code>guest ok = Yes</code></em></td></tr><tr><td><a class="indexterm" name="id328886"></a><em class="parameter"><code>use client driver = Yes</code></em></td></tr><tr><td><a class="indexterm" name="id328896"></a><em class="parameter"><code>browseable = No</code></em></td></tr><tr><td> </td></tr><tr><td><em class="parameter"><code>[netlogon]</code></em></td></tr><tr><td><a class="indexterm" name="id328915"></a><em class="parameter"><code>comment = Network Logon Service</code></em></td></tr><tr><td><a class="indexterm" name="id328925"></a><em class="parameter"><code>path = /data/%U</code></em></td></tr><tr><td><a class="indexterm" name="id328936"></a><em class="parameter"><code>valid users = %S</code></em></td></tr><tr><td><a class="indexterm" name="id328946"></a><em class="parameter"><code>read only = No</code></em></td></tr><tr><td> </td></tr><tr><td><em class="parameter"><code>[accounts]</code></em></td></tr><tr><td><a class="indexterm" name="id328965"></a><em class="parameter"><code>comment = Accounting Files</code></em></td></tr><tr><td><a class="indexterm" name="id328975"></a><em class="parameter"><code>path = /data/accounts</code></em></td></tr><tr><td><a class="indexterm" name="id328986"></a><em class="parameter"><code>valid users = %G</code></em></td></tr><tr><td><a class="indexterm" name="id328996"></a><em class="parameter"><code>read only = No</code></em></td></tr><tr><td> </td></tr><tr><td><em class="parameter"><code>[finsrvcs]</code></em></td></tr><tr><td><a class="indexterm" name="id329015"></a><em class="parameter"><code>comment = Financial Service Files</code></em></td></tr><tr><td><a class="indexterm" name="id329025"></a><em class="parameter"><code>path = /data/finsrvcs</code></em></td></tr><tr><td><a class="indexterm" name="id329036"></a><em class="parameter"><code>valid users = %G</code></em></td></tr><tr><td><a class="indexterm" name="id329046"></a><em class="parameter"><code>read only = No</code></em></td></tr></table></div></div><br class="example-break"><div class="sect2" title="Validation"><div class="titlepage"><div><div><h3 class="title"><a name="id329058"></a>Validation</h3></div></div></div><p>
		Does everything function as it ought? That is the key question at this point.
		Here are some simple steps to validate your Samba server configuration.
		</p><div class="procedure" title="Procedure2.2.Validation Steps"><a name="id329068"></a><p class="title"><b>Procedure2.2.Validation Steps</b></p><ol class="procedure" type="1"><li class="step" title="Step 1"><p>
			<a class="indexterm" name="id329078"></a>
			If your <code class="filename">smb.conf</code> file has bogus options or parameters, this may cause Samba
			to refuse to start. The first step should always be to validate the contents
			of this file by running:
</p><pre class="screen">
<code class="prompt">root# </code> testparm -s
Load smb config files from smb.conf
Processing section "[homes]"
Processing section "[printers]"
Processing section "[netlogon]"
Processing section "[accounts]"
Processing section "[service]"
Loaded services file OK.
# Global parameters
[global]
        workgroup = BILLMORE
        passwd chat = *New*Password* \
		%n\n *Re-enter*new*password* %n\n *Password*changed*
        username map = /etc/samba/smbusers
        syslog = 0
        name resolve order = wins bcast hosts
        printcap name = CUPS
        show add printer wizard = No
        add user script = /usr/sbin/useradd -m -G users '%u'
        delete user script = /usr/sbin/userdel -r '%u'
        add group script = /usr/sbin/groupadd '%g'
        delete group script = /usr/sbin/groupdel '%g'
        add user to group script = /usr/sbin/usermod -A '%g' '%u'
        add machine script = /usr/sbin/useradd
				-s /bin/false -d /var/lib/nobody '%u'
        logon script = scripts\logon.bat
        logon path =
        logon drive = X:
        domain logons = Yes
        preferred master = Yes
        wins support = Yes
...
### Remainder cut to save space ###
</pre><p>
			The inclusion of an invalid parameter (say one called dogbert) would generate an
			error as follows:
</p><pre class="screen">
Unknown parameter encountered: "dogbert"
Ignoring unknown parameter "dogbert"
</pre><p>
			Clear away all errors before proceeding, and start or restart samba as necessary.
			</p></li><li class="step" title="Step 2"><p>
			<a class="indexterm" name="id329135"></a>
			<a class="indexterm" name="id329141"></a>
			<a class="indexterm" name="id329148"></a>
			<a class="indexterm" name="id329154"></a>
			Check that the Samba server is running:
</p><pre class="screen">
<code class="prompt">root# </code> ps ax | grep mbd
14244 ?        S      0:00 /usr/sbin/nmbd -D
14245 ?        S      0:00 /usr/sbin/nmbd -D
14290 ?        S      0:00 /usr/sbin/smbd -D

$rootprompt; ps ax | grep winbind
14293 ?        S     0:00 /usr/sbin/winbindd -D
14295 ?        S     0:00 /usr/sbin/winbindd -D
</pre><p>
			The <code class="literal">winbindd</code> daemon is running in split mode (normal), so there are also
			two instances of it. For more information regarding <code class="literal">winbindd</code>, see
			<span class="emphasis"><em>TOSHARG2</em></span>, Chapter 23, Section 23.3. The single instance of
			<code class="literal">smbd</code> is normal.
			</p></li><li class="step" title="Step 3"><p>
			<a class="indexterm" name="id329199"></a>
			Check that an anonymous connection can be made to the Samba server:
</p><pre class="screen">
<code class="prompt">root# </code> smbclient -L localhost -U%

        Sharename      Type      Comment
        ---------      ----      -------
        netlogon       Disk      Network Logon Service
        accounts       Disk      Accounting Files
        finsvcs        Disk      Financial Service Files
        IPC$           IPC       IPC Service (Samba3)
        ADMIN$         IPC       IPC Service (Samba3)
        hplj4          Printer   Hewlett-Packard LaserJet 4
        hplj6          Printer   Hewlett-Packard LaserJet 6
        qms            Printer   QMS Magicolor Laser Printer XXXX

        Server               Comment
        ---------            -------
        SLEETH               Samba 3.0.20

        Workgroup            Master
        ---------            -------
        BILLMORE             SLEETH
</pre><p>
			This demonstrates that an anonymous listing of shares can be obtained. This is the equivalent
			of browsing the server from a Windows client to obtain a list of shares on the server.
			The <code class="constant">-U%</code> argument means to send a <code class="constant">NULL</code> username and
			a <code class="constant">NULL</code> password.
			</p></li><li class="step" title="Step 4"><p>
			<a class="indexterm" name="id329241"></a>
			<a class="indexterm" name="id329247"></a>
			<a class="indexterm" name="id329254"></a>
			Verify that the printers have the IP addresses assigned in the DHCP server configuration file.
			The easiest way to do this is to ping the printer name. Immediately after the ping response
			has been received, execute <code class="literal">arp -a</code> to find the MAC address of the printer
			that has responded. Now you can compare the IP address and the MAC address of the printer
			with the configuration information in the <code class="filename">/etc/dhcpd.conf</code> file. They
			should, of course, match. For example,
</p><pre class="screen">
<code class="prompt">root# </code> ping hplj4
PING hplj4 (192.168.1.11) 56(84) bytes of data.
64 bytes from hplj4 (192.168.1.11): icmp_seq=1 ttl=64 time=0.113 ms

<code class="prompt">root# </code> arp -a
hplj4 (192.168.1.11) at 08:00:46:7A:35:E4 [ether] on eth0
</pre><p>
			The MAC address <code class="constant">08:00:46:7A:35:E4</code> matches that specified for the
			IP address from which the printer has responded and the entry for it in the
			<code class="filename">/etc/dhcpd.conf</code> file.
			</p></li><li class="step" title="Step 5"><p>
			<a class="indexterm" name="id329307"></a>
			Make an authenticated connection to the server using the <code class="literal">smbclient</code> tool:
</p><pre class="screen">
<code class="prompt">root# </code> smbclient //sleeth/accounts -U alanm
Password: XXXXXXX
smb: \&gt; dir
  .                          D        0  Sun Nov  9 01:28:34 2003
  ..                         D        0  Sat Aug 16 17:24:26 2003
  .mc                       DH        0  Sat Nov  8 21:57:38 2003
  .qt                       DH        0  Fri Sep  5 00:48:25 2003
  SMB                        D        0  Sun Oct 19 23:04:30 2003
  Documents                  D        0  Sat Nov  1 00:31:51 2003
  xpsp1a_en_x86.exe           131170400  Sun Nov  2 01:25:44 2003

           65387 blocks of size 65536. 28590 blocks available
smb: \&gt; q
</pre><p>
			</p></li></ol></div></div><div class="procedure" title="Procedure2.3.Windows XP Professional Client Configuration"><a name="id329344"></a><p class="title"><b>Procedure2.3.Windows XP Professional Client Configuration</b></p><ol class="procedure" type="1"><li class="step" title="Step 1"><p>
		Configure clients to the network settings shown in <a class="link" href="small.html#acct2net" title="Figure2.1.Abmas Accounting 52-User Network Topology">&#8220;Abmas Accounting  52-User Network Topology&#8221;</a>.
		All clients use DHCP for TCP/IP protocol stack configuration.
		<a class="indexterm" name="id329359"></a>
		<a class="indexterm" name="id329366"></a>
		DHCP configures all Windows clients to use the WINS Server address <code class="constant">192.168.1.1</code>.
		</p></li><li class="step" title="Step 2"><p>
		Join the Windows Domain called <code class="constant">BILLMORE</code>. Use the Domain Administrator
		username <code class="constant">root</code> and the SMB password you assigned to this account.
		A detailed step-by-step procedure for joining a Windows 200x/XP Professional client to
		a Windows Domain is given in <a class="link" href="appendix.html" title="Chapter15.A Collection of Useful Tidbits">&#8220;A Collection of Useful Tidbits&#8221;</a>, <a class="link" href="appendix.html#domjoin" title="Joining a Domain: Windows 200x/XP Professional">&#8220;Joining a Domain: Windows 200x/XP Professional&#8221;</a>.
		Reboot the machine as prompted and then log on using a Domain User account.
		</p></li><li class="step" title="Step 3"><p>
		Verify on each client that the machine called <code class="constant">SLEETH</code>
		is visible in <span class="guimenu">My Network Places</span>, that it is
		possible to connect to it and see the shares <span class="guimenuitem">accounts</span>
		 and <span class="guimenuitem">finsvcs</span>,
		and that it is possible to open that share to reveal its contents.
		</p></li><li class="step" title="Step 4"><p>
		Instruct all users to log onto the workstation using their assigned username and password.
		</p></li><li class="step" title="Step 5"><p>
		Install a printer on each using the following steps:
		</p><div class="procedure"><ol class="procedure" type="1"><li class="step" title="Step 5.1"><p>
				Click <span class="guimenu">Start</span> &#8594; <span class="guimenuitem">Settings</span> &#8594; <span class="guimenuitem">Printers</span>+<span class="guiicon">Add Printer</span>+<span class="guibutton">Next</span>. Do not click <span class="guimenuitem">Network printer</span>.
					Ensure that <span class="guimenuitem">Local printer</span> is selected.
				</p></li><li class="step" title="Step 5.2"><p>
				Click <span class="guibutton">Next</span>. In the
				<span class="guimenuitem">Manufacturer:</span> panel, select <code class="constant">HP</code>.
				In the <span class="guimenuitem">Printers:</span> panel, select the printer called
				<code class="constant">HP LaserJet 4</code>. Click <span class="guibutton">Next</span>.
				</p></li><li class="step" title="Step 5.3"><p>
				In the <span class="guimenuitem">Available ports:</span> panel, select
				<code class="constant">FILE:</code>. Accept the default printer name by clicking
				<span class="guibutton">Next</span>. When asked, <span class="quote">&#8220;<span class="quote">Would you like to print a
				test page?</span>&#8221;</span>, click <span class="guimenuitem">No</span>. Click
				<span class="guibutton">Finish</span>.
				</p></li><li class="step" title="Step 5.4"><p>
				You may be prompted for the name of a file to print to. If so, close the
				dialog panel. Right-click <span class="guiicon">HP LaserJet 4</span> &#8594; <span class="guimenuitem">Properties</span> &#8594; <span class="guisubmenu">Details (Tab)</span> &#8594; <span class="guimenuitem">Add Port</span>.
				</p></li><li class="step" title="Step 5.5"><p>
				In the <span class="guimenuitem">Network</span> panel, enter the name of
				the print queue on the Samba server as follows: <code class="constant">\\SERVER\hplj4</code>.
				Click <span class="guibutton">OK</span>+<span class="guibutton">OK</span> to complete the installation.
				</p></li><li class="step" title="Step 5.6"><p>
				Repeat the printer installation steps above for the HP LaserJet 6 printer
				as well as for the QMS Magicolor XXXX laser printer.
				</p></li></ol></div></li></ol></div><div class="sect2" title="Notebook Computers: A Special Case"><div class="titlepage"><div><div><h3 class="title"><a name="id329633"></a>Notebook Computers: A Special Case</h3></div></div></div><p>
	As a network administrator, you already know how to create local machine accounts for Windows 200x/XP
	Professional systems. This is the preferred solution to provide continuity of work for notebook users
	so that absence from the office network environment does not become a barrier to productivity.
	</p><p>
	By creating a local machine account that has the same username and password as you create for that
	user in the Windows Domain environment, the user can log onto the machine locally and still
	transparently access network resources as if logged onto the domain itself. There are some trade-offs
	that mean that as the network is more tightly secured, it becomes necessary to modify Windows client
	configuration somewhat.
	</p></div><div class="sect2" title="Key Points Learned"><div class="titlepage"><div><div><h3 class="title"><a name="id329652"></a>Key Points Learned</h3></div></div></div><p>
		In this network design and implementation exercise, you created a Windows NT4-style Domain
		Controller using Samba-3.0.20. Following these guidelines, you experienced
		and implemented several important aspects of Windows networking. In the next chapter,
		you build on the experience. These are the highlights from this chapter:
		</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>
			<a class="indexterm" name="id329669"></a>
			You implemented a DHCP server, and Microsoft Windows clients were able to obtain all necessary
			network configuration settings from this server.
			</p></li><li class="listitem"><p>
			<a class="indexterm" name="id329681"></a>
			You created a Windows Domain Controller. You were able to use the network logon service
			and successfully joined Windows 200x/XP Professional clients to the Domain.
			</p></li><li class="listitem"><p>
			<a class="indexterm" name="id329693"></a>
			You created raw print queues in the CUPS printing system. You maintained a simple
			printing system so that all users can share centrally managed printers. You installed
			native printer drivers on the Windows clients.
			</p></li><li class="listitem"><p>
			You experienced the benefits of centrally managed user accounts on the server.
			</p></li><li class="listitem"><p>
			You offered Mobile notebook users a solution that allows them to continue to work
			while away from the office and not connected to the corporate network.
			</p></li></ul></div></div></div><div class="sect1" title="Questions and Answers"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id329716"></a>Questions and Answers</h2></div></div></div><p>
	Your new Domain Controller is ready to serve you. What does it mean? Here are some questions and answers that
	may help.
	</p><div class="qandaset" title="Frequently Asked Questions"><a name="id329726"></a><dl><dt>1. <a href="small.html#id329728">
		What is the key benefit of using DHCP to configure Windows client TCP/IP stacks?
		</a></dt><dt>2. <a href="small.html#id329750">
		Are there any DHCP server configuration parameters in the /etc/dhcpd.conf
		that should be noted in particular?
		</a></dt><dt>3. <a href="small.html#id329776">
		Is it possible to create a Windows Domain account that is specifically called Administrator?
		</a></dt><dt>4. <a href="small.html#id329810">
		Why is it necessary to give the Windows Domain Administrator a UNIX UID of 0?
		</a></dt><dt>5. <a href="small.html#id329843">
		One of my junior staff needs the ability to add machines to the Domain, but I do not want to give him
		root access. How can we do this?
		</a></dt><dt>6. <a href="small.html#id329878">
		Why must I map Windows Domain Groups to UNIX groups?
		</a></dt><dt>7. <a href="small.html#id329912">
		I deleted my root account and now I cannot add it back! What can I do?
		</a></dt><dt>8. <a href="small.html#id329978">
		When I run net groupmap list, it reports a group called Administrators
		as well as Domain Admins. What is the difference between them?
		</a></dt><dt>9. <a href="small.html#id330018">
		What is the effect of changing the name of a Samba server or of changing the Domain name?
		</a></dt><dt>10. <a href="small.html#id330060">
		How can I manage user accounts from my Windows XP Professional workstation?
		</a></dt></dl><table border="0" width="100%" summary="Q and A Set"><col align="left" width="1%"><col><tbody><tr class="question" title="1."><td align="left" valign="top"><a name="id329728"></a><a name="id329730"></a><p><b>1.</b></p></td><td align="left" valign="top"><p>
		What is the key benefit of using DHCP to configure Windows client TCP/IP stacks?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		First and foremost, portability. It means that notebook users can move between
		the Abmas office and client offices (so long as they, too, use DHCP) without having to manually
		reconfigure their machines. It also means that when they work from their home environments
		either using DHCP assigned addressing or when using dial-up networking, settings such as
		default routes and DNS server addresses that apply only to the Abmas office environment do
		not interfere with remote operations. This is an extremely important feature of DHCP.
		</p></td></tr><tr class="question" title="2."><td align="left" valign="top"><a name="id329750"></a><a name="id329752"></a><p><b>2.</b></p></td><td align="left" valign="top"><p>
		Are there any DHCP server configuration parameters in the <code class="filename">/etc/dhcpd.conf</code>
		that should be noted in particular?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		Yes. The configuration you created automatically provides each client with the IP address
		of your WINS server. It also configures the client to preferentially register NetBIOS names
		with the WINS server, and then instructs the client to first query the WINS server when a
		NetBIOS machine name needs to be resolved to an IP Address. This configuration
		results in far lower UDP broadcast traffic than would be the case if WINS was not used.
		</p></td></tr><tr class="question" title="3."><td align="left" valign="top"><a name="id329776"></a><a name="id329778"></a><p><b>3.</b></p></td><td align="left" valign="top"><p>
		Is it possible to create a Windows Domain account that is specifically called <code class="constant">Administrator</code>?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		You can surely create a Windows Domain account called <code class="constant">Administrator</code>. It is also
		possible to map that account so that it has the effective UNIX UID of 0. This way it isn't
		necessary to use the <em class="parameter"><code>username map</code></em> facility to map this account to the UNIX
		account called <code class="constant">root</code>.
		</p></td></tr><tr class="question" title="4."><td align="left" valign="top"><a name="id329810"></a><a name="id329812"></a><p><b>4.</b></p></td><td align="left" valign="top"><p>
		Why is it necessary to give the Windows Domain <code class="constant">Administrator</code> a UNIX UID of 0?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		The Windows Domain <code class="constant">Administrator</code> account is the most privileged account that
		exists on the Windows platform. This user can change any setting, add, delete, or modify user
		accounts, and completely reconfigure the system. The equivalent to this account in the UNIX
		environment is the <code class="constant">root</code> account. If you want to permit the Windows Domain
		Administrator to manage accounts as well as permissions, privileges, and security
		settings within the Domain and on the Samba server, equivalent rights must be assigned. This is
		achieved with the <code class="constant">root</code> UID equal to 0.
		</p></td></tr><tr class="question" title="5."><td align="left" valign="top"><a name="id329843"></a><a name="id329845"></a><p><b>5.</b></p></td><td align="left" valign="top"><p>
		One of my junior staff needs the ability to add machines to the Domain, but I do not want to give him
		<code class="constant">root</code> access. How can we do this?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		Users who are members of the <code class="constant">Domain Admins</code> group can add machines to the
		Domain. This group is mapped to the UNIX group account called <code class="constant">root</code>
		(or the equivalent <code class="constant">wheel</code> on some UNIX systems) that has a GID of 0.
		This must be the primary GID of the account of the user who is a member of the Windows <code class="constant">
		Domain Admins</code> account.
		</p></td></tr><tr class="question" title="6."><td align="left" valign="top"><a name="id329878"></a><a name="id329880"></a><p><b>6.</b></p></td><td align="left" valign="top"><p>
		Why must I map Windows Domain Groups to UNIX groups?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		Samba-3 does not permit a Domain Group to become visible to Domain network clients unless the account
		has a UNIX group account equivalent. The Domain groups that should be given UNIX equivalents are
		<span class="guimenu">Domain Guests</span>, <span class="guimenu">Domain Users</span>, and <span class="guimenu">Domain Admins</span>.
		</p></td></tr><tr class="question" title="7."><td align="left" valign="top"><a name="id329912"></a><a name="id329914"></a><p><b>7.</b></p></td><td align="left" valign="top"><p>
		I deleted my <code class="constant">root</code> account and now I cannot add it back! What can I do?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		This is a nasty problem. Fortunately, there is a solution.
		</p><div class="procedure"><ol class="procedure" type="1"><li class="step" title="Step 1"><p>
			Back up your existing configuration files in case you need to restore them.
			</p></li><li class="step" title="Step 2"><p>
			Rename the <code class="filename">group_mapping.tdb</code> file.
			</p></li><li class="step" title="Step 3"><p>
			Use the <code class="literal">smbpasswd</code> to add the root account.
			</p></li><li class="step" title="Step 4"><p>
			Restore the <code class="filename">group_mapping.tdb</code> file.
			</p></li></ol></div></td></tr><tr class="question" title="8."><td align="left" valign="top"><a name="id329978"></a><a name="id329980"></a><p><b>8.</b></p></td><td align="left" valign="top"><p>
		When I run <code class="literal">net groupmap list</code>, it reports a group called <span class="guimenu">Administrators</span>
		as well as <span class="guimenu">Domain Admins</span>. What is the difference between them?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		The group called <span class="guimenu">Administrators</span> is representative of the same account that would be
		present as the Local Group account on a Domain Member server or workstation. Samba uses only Domain
		Groups at this time. A Workstation or Server Local Group has no meaning in a Samba context. This
		may change at some later date. These accounts are provided only so that security objects are correctly shown.
		</p></td></tr><tr class="question" title="9."><td align="left" valign="top"><a name="id330018"></a><a name="id330020"></a><p><b>9.</b></p></td><td align="left" valign="top"><p>
		What is the effect of changing the name of a Samba server or of changing the Domain name?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		If you elect to change the name of the Samba server, on restarting <code class="literal">smbd</code>,
		Windows security identifiers are changed. In the case of a standalone server or a Domain Member server,
		the machine SID is changed. This may break Domain membership. In the case of a change of the Domain name
		(Workgroup name), the Domain SID is changed. This affects all Domain memberships.
		</p><p>
		If it becomes necessary to change either the server name or the Domain name, be sure to back up the respective
		SID before the change is made. You can back up the SID using the <code class="literal">net getlocalsid</code> (Samba-3)
		or the <code class="literal">smbpasswd</code> (Samba-2.2.x). To change the SID, you use the same tool. Be sure
		to check the man page for this command for detailed instructions regarding the steps involved.
		</p></td></tr><tr class="question" title="10."><td align="left" valign="top"><a name="id330060"></a><a name="id330062"></a><p><b>10.</b></p></td><td align="left" valign="top"><p>
		How can I manage user accounts from my Windows XP Professional workstation?
		</p></td></tr><tr class="answer"><td align="left" valign="top"></td><td align="left" valign="top"><p>
		Samba-3 implements a Windows NT4-style security domain architecture. This type of Domain cannot
		be managed using tools present on a Windows XP Professional installation. You may download from the
		Microsoft Web site the SRVTOOLS.EXE package. Extract it into the directory from which you wish to use
		it. This package extracts the tools: <code class="literal">User Manager for Domains</code>, <code class="literal">Server Manager</code>, and <code class="literal">Event
		Viewer</code>. You may use the <span class="guimenu">User Manager for Domains</span> to manage your Samba-3
		Domain user and group accounts. Of course, you do need to be logged on as the <code class="constant">Administrator</code>
		for the Samba-3 Domain. It may help to log on as the <code class="constant">root</code> account.
		</p></td></tr></tbody></table></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="simple.html">Prev</a></td><td width="20%" align="center"><a accesskey="u" href="ExNetworks.html">Up</a></td><td width="40%" align="right"><a accesskey="n" href="secure.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter1.No-Frills Samba Servers</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">Chapter3.Secure Office Networking</td></tr></table></div></body></html>