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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /><title>IProtocol Decodes: ICMP6</title>
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<h2 style="text-align: left;">Network Layer Decodes</h2>
<h3>Class ICMP6</h3>
<p>Provides access to fields in an (IPv6) ICMP header.</p>
<table class="indent1">
<tbody>
<tr>
<td class="heading" colspan="2">Instance Variables</td>
</tr>
<tr>
<td class="name methodwidth"><strong>type</strong></td>
<td class="name descriptionwidth"><em>icmp.type ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">ICMP message type </td>
</tr>
<tr>
<td class="name"><strong>code</strong></td>
<td class="name"><em>icmp.code ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">ICMP message code </td>
</tr>
<tr>
<td class="name"><strong>checksum</strong></td>
<td class="name"><em>icmp.checksum ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">ICMP checksum </td>
</tr>
<tr><td style="font-weight: bold;" class="name">data</td><td class="name"><em>icmp.data ->
aByteArray</em></td>
</tr>
<tr>
<td><br />
</td><td class="description">All the ICMP bytes, i.e. header and payload.
Use this if you need to work with some of the ICMP message types that
python-libtrace doesn't decode fully</td>
</tr>
<tr>
<td style="font-weight: bold;" class="name">payload</td><td class="name"><em>icmp.payload ->anIP6 for types 1, 2, 3 and 4, otherwise aByteArray</em></td>
</tr>
<tr>
<td><br />
</td><td class="description">Some ICMP messages carry content
from the packet that triggered them; icmp6.payload returns as much
as it can of the triggering packet</td>
</tr>
</tbody>
</table>
<p>The content of an (IPv6) ICMP header varies depending on its <span style="font-style: italic;">type</span> field. python-libtrace decodes the following types ...<span style="font-style: italic;" /></p>
<span style="font-weight: bold;" /><table class="indent1"><tbody><tr><td class="heading" colspan="2">Echo Request (type 128) and Echo Reply (type 129)</td></tr><tr><td class="name methodwidth"><strong style="font-weight: bold;" /><span style="font-weight: bold;">ident</span></td>
<td class="name descriptionwidth"><em>icmp6.echo.ident ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Echo identifier </td>
</tr>
<tr>
<td class="name"><strong>sequence </strong></td>
<td class="name"><em>icmp6.echo.sequence ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Echo sequence number </td>
</tr>
</tbody>
</table><br />
<span style="font-weight: bold;" /><table class="indent1"><tbody><tr><td class="heading" colspan="2">Packet too big (type 2)</td></tr><tr><td class="name methodwidth"><strong style="font-weight: bold;" /><span style="font-weight: bold;">mtu</span></td>
<td class="name descriptionwidth"><em>icmp6.toobig.mtu ->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">MTU of link causing problem. Used as part of the Path MTU Discovery process</td>
</tr>
</tbody>
</table><br />
<span style="font-weight: bold;" /><table class="indent1"><tbody><tr><td class="heading" colspan="2">Parameter problem (type 4)</td></tr><tr><td class="name methodwidth"><strong style="font-weight: bold;" /><span style="font-weight: bold;">pointer</span></td>
<td class="name descriptionwidth"><em>icmp6.param.pointer->
anInteger</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Offset within the invoking packet where an error was detected</td>
</tr>
</tbody>
</table><br />
<span style="font-weight: bold;" /><table class="indent1"><tbody><tr><td class="heading" colspan="2">Neighbour discovery (types 135-136), Redirect (type 137)</td></tr><tr><td class="name methodwidth"><strong style="font-weight: bold;" /><span style="font-weight: bold;">target_prefix</span></td>
<td class="name descriptionwidth"><em>icmp6.neighbour.target_prefix ->
anIPprefix</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description"> IPv6 address of the solicitation's target</td>
</tr>
<tr>
<td class="name"><strong>dest-prefix</strong></td>
<td class="name"><em>icmp6.neighbour.target.dest_prefix -> anIPprefix</em></td>
</tr>
<tr>
<td><br />
</td>
<td class="description">Source Address of the packet that triggered the redirect message </td>
</tr>
</tbody>
</table><br /><p>Nevil Brownlee<br />
Sat, 22 Oct 16 (NZDT)</p>
</body></html>
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