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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<head>
<meta name="generator" content="HTML Tidy for Linux/x86 (vers 1st December 2004), see www.w3.org">
<title>EtherApe FAQ</title>
<link rel="STYLESHEET" type="text/css" href="etherape.css">
<style type="text/css">
span.q { font-weight : bold }
div.a { margin-bottom: 1em }
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<body>
<h1>EtherApe FAQ</h1>
<ul>
<li>
<span style="font-weight: bold;">Why I see only</span><span class="q"> the traffic to/from the EtherApe machine ?</span><br>
<div class="a"> Probably you have a switched network. Unless
all traffic goes thru the etherape machine (or you have an hub),
etherape sees local traffic. <br>
Etherape can "see" only the traffic physically passing on the netcard
wire. Many small network use hubs to connect computers, so every packet
is physically transmitted to every netcard. <br>
A larger network use combinations of switches and routers, sometimes
even firewalls to connect nodes, so your network card receives only its
own traffic or broadcast. <br>
To monitor an entire network you can enable analisys/roving mode on
your switch (essentially copies all traffic to a single port). If you
have multiple switches, or routers, or the total bandwith exceeds the
port maximum, you still will see only part of the traffic. <br>
If you only want to monitor internet traffic, a better solution is to place etherape on the (internal) internet gateway. <br>
</div>
</li>
<li>
<span class="q">How can I see the detail dialogs ?</span><br>
<div class="a">
Double click on a node or link opens the corrisponding dialog.</div>
</li>
<li>
<span class="q">Why is one computer constantly changing
names?</span><br>
<div class="a">
You are running in ethernet mode. Switch to IP mode.
</div>
</li>
<li><span class="q">Why can I only see computers on my own
network?</span><br>
<div class="a">
See question above
</div>
</li>
<li>
<span class="q">I can't see any text, just little squares.
What gives?</span><br>
<div class="a">
Go to preferences and change the text font. Make sure you
save your changes
</div>
</li>
<li>
<span class="q">Is it possible to see just traffic within my
network? Is it possible to see just traffic to/from the
internet?</span><br>
<div class="a">
You can indeed filter traffic. Have a look at the filter
entry in preferences->capture->filter<br>
Suppose your network address starts with 213.227<br>
If you only want to see traffic within your network, then
the proper syntax is<br>
<tt>ip and src net 213.227 and dst net 213.227</tt><br>
Or if you want to see connections to/from outside your
network then try something like<br>
<tt>ip and ((not src net 213.227) and dst net 213.227) or
(src net 213.227 and (not dst net 213.227))</tt>
</div>
</li>
<li>
<span class="q">What's the format for /etc/ethers?</span><br>
<div class="a">
Just pairs of Ethernet addresses and names, like<br>
<tt>00:40:33:35:80:5F LAZARO<br>
00:40:33:35:80:6D NEBAJ<br>
00:C0:26:A2:58:FE ARGOS</tt>
</div>
</li>
<li>
<span class="q">How do I find the ether address of an IP
node?</span><br>
<div class="a">
Here is an example:<br>
<tt>argos:~# ping lazaro<br>
PING lazaro.tattoine.es (192.168.1.1): 56 data bytes<br>
64 bytes from 192.168.1.1: icmp_seq=0 ttl=255 time=1.8
ms<br>
round-trip min/avg/max = 1.6/1.7/1.8 ms<br>
argos:~# arp lazaro<br>
Address HWtype HWaddress Iface<br>
lazaro.tattoine.es ether 00:40:33:35:80:5F eth0</tt>
<p>Of course, you can only do this for nodes in your
network.
</p>
</div>
</li>
<li>
<span class="q">How do I find the IP corresponding to an
ether address?<br>
</span>
<div class="a">
You could, for instance, use <tt><br>
argos:~# tcpdump -f "ether src 00:40:33:35:80:5F" -n<br>
tcpdump: listening on eth0<br>
10:34:11.116930 192.168.1.1.7002 > 192.168.1.2.1031: P
76753564:76753576(12)</tt>
<p>There you have it, the IP src is 192.168.1.1
</p>
</div>
</li>
<li>
<span class="q">Hosts keep moving because they come and go...
What can I do?</span><br>
<div class="a">
Set node timeout to 0.
</div>
</li>
</ul>
<hr>
<i>$Id: FAQ.html,v 1.16 2006/04/16 10:56:57 bchiara Exp $</i>
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