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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /><title>Protocol Decodes: IP</title><meta name="generator" content="LompoZer" /><link rel="stylesheet" type="text/css" href="plt-doc.css" /></head><body>
<h2>Network Layer Decodes</h2>
<h3>Class IP</h3>
<p>Provides access to fields in an IPv4 header. Further, you can see any following IP Options by using <span style="font-style: italic;">pkt.Layer3; </span>see the Layers Decode page.</p>
<br />
<table class="indent1">
<tbody>
<tr><td class="heading" colspan="2">Instance Variables</td></tr><tr>
<td class="name methodwidth"><strong>version</strong></td>
<td style="background-color: rgb(153, 255, 153);" class="name descriptionwidth"><em>ip.version -> anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">IP Version, 4 for IPv4
</td>
</tr>
<tr>
<td class="name"><strong>hdr_len</strong></td>
<td class="name"><em>ip.hdr_len -> anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">IP Header Length, in 4-byte units
</td>
</tr>
<tr>
<td class="name"><strong>traffic_class</strong></td>
<td class="name"><em>ip.traffic_class -> anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Originally IPv4 Type-Of-Service, now used for DSCP and ECN. (Traffic Class is its IPv6 name)
</td>
</tr>
<tr>
<td class="name"><strong>pkt_len</strong></td>
<td class="name"><em>ip.pkt_len -> anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Total Length of IP packet
</td>
</tr>
<tr>
<td class="name"><strong>ident</strong></td>
<td class="name"><em>ip.iden t-> anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">IP Identification
</td>
</tr>
<tr>
<td class="name"><strong>has_rf</strong></td>
<td class="name"><em>ip.has_rf -> true or false</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">True if 'Reserved' IP flag is 1
</td>
</tr>
<tr>
<td class="name"><strong>has_df</strong></td>
<td class="name"><em>ip.has_df --> true or false</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">True if 'Don't Fragment' IP flag is 1
</td>
</tr>
<tr>
<td class="name"><strong>has_mf</strong></td>
<td class="name"><em>ip.has_mf -> true or false</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">True if 'More Fragments' IP flag is 1
</td>
</tr>
<tr>
<td class="name"><strong>frag_offset</strong></td>
<td class="name"><em>ip.frag_offset -> anInteger</em> </td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Fragment Offset, in 8-byte units
</td>
</tr>
<tr>
<td class="name"><strong>ttl</strong></td>
<td class="name"><em>ip.ttl -> anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">IP Time to Live (TTL)
</td>
</tr>
<tr>
<td class="name"><span style="font-weight: bold;">proto</span><strong /></td>
<td class="name"><em>ip.proto -> anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">IP Protocol, e.g. 6 = TCP, 17 = UDP, 1 = ICMP
</td>
</tr>
<tr>
<td class="name"><strong>hdr_checksum</strong></td>
<td class="name"><em>ip.hdr_checksum -> anInteger</em> </td>
</tr>
<tr>
<td><br />
</td>
<td class="description">IP Header Checksum
</td>
</tr>
<tr>
<td class="name"><strong>src_prefix<em /></strong></td>
<td class="name"><em>ip.src_prefix -> anIPprefix</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">IPv4 source address
</td>
</tr>
<tr>
<td class="name"><strong>dst_prefix</strong></td>
<td class="name"><em>ip.dst_prefix -> anIPprefix</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">IPv4 destination address
</td>
</tr>
<tr>
<td class="name"><strong>payload</strong></td>
<td class="name"><em>ip.payload -> aByteArray</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Byte array containing the IP object's payload<br />
<span style="font-style: italic;"></span>
</td>
</tr>
</tbody></table>
<br />A few of the fields in an IP object may be set to new values, as follows:<br /><br /><table class="indent1">
<tbody>
<tr><td class="heading" colspan="2">Class <span style="font-style: italic;">set</span> Methods</td></tr>
<tr>
<td class="name methodwidth"><strong>traffic_class=</strong></td>
<td class="name descriptionwidth"><em>ip.traffic_class = anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Sets the <span style="font-style: italic;">traffic_class</span> value in an <span style="font-style: italic;">IP</span>
</td>
</tr>
<tr>
<td class="name"><strong>ttl=</strong></td>
<td class="name"><em>ip.ttl = anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Sets the Time to Live (TTL) in an <span style="font-style: italic;">IP</span>
</td>
</tr>
<tr>
<td class="name"><span style="font-weight: bold;">checksum=</span></td>
<td class="name"><em>ip.checksum = anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Sets Header Checksum in an <span style="font-style: italic;">IP</span>
</td>
</tr>
<tr>
<td class="name"><strong>src_prefix=<em /></strong></td>
<td class="name"><em>ip.src_prefix = anIPprefix</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Sets the IPv4 source address in an <span style="font-style: italic;">IP</span>
</td>
</tr>
<tr>
<td class="name"><strong>dst_prefix=</strong></td>
<td class="name"><em>ip.dst_prefix = anIPprefix</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Sets the IPv4 destination address in an <span style="font-style: italic;">IP</span>
</td>
</tr>
</tbody>
</table>
<br />
<p>Nevil Brownlee<br />Mon, 30 Jun 14 (NZST)</p>
</body></html>
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