64 lines
3.5 KiB
HTML
64 lines
3.5 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="DC.Type" content="topic" />
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<meta name="DC.Title" content="Recover from a virtual Ethernet network failure" />
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<meta name="abstract" content="Learn how to recover from a virtual Ethernet network failure after a kernel upgrade." />
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<meta name="description" content="Learn how to recover from a virtual Ethernet network failure after a kernel upgrade." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Identifier" content="rzalmnetworkfailure" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Recover from a virtual Ethernet network failure</title>
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</head>
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<body id="rzalmnetworkfailure"><a name="rzalmnetworkfailure"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Recover from a virtual Ethernet network failure</h1>
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<div><p>Learn how to recover from a virtual Ethernet network failure after
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a kernel upgrade.</p>
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<p>If you have upgraded to a 64-bit kernel (from a 32-bit kernel less than
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2.4.10) or to a 32-bit kernel level greater that 2.4.10, your network device
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information may have changed. The notation of the virtual network devices
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in Linux has changed from vethXY to ethXY.</p>
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<p>To understand what network devices relates to a respective virtual Ethernet
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line description, you can view the display message log using this command:</p>
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<blockquote><pre>dmesg | fgrep veth | less</pre>
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</blockquote>
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<p>The output of this command should produce messages similar to the following:</p>
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<blockquote><pre>veth.c: Found an Ethernet device eth0 (veth=0) (addr=c000000000ff2800)</pre>
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</blockquote>
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<p>In this case, the message is telling you that the i5/OS<sup>®</sup> virtual line description veth0
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now relates to a Linux net device of eth0, and veth=0 correlates to VLAN0
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in i5/OS.
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If for some reason your display message log is overrun, you can also analyze
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the network devices in the proc fileserver with the following command:</p>
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<blockquote><pre>cat /proc/iSeries/veth/[netdevice]</pre>
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</blockquote>
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<p>Running this command with a valid netdevice will produce output similar
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to this:</p>
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<blockquote><pre>Net device: c000000000ff2800
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Net device name: eth0
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Address: 0201FF00FF01
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Promiscuous: 0
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All multicast: 0
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Number multicast: 0</pre>
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</blockquote>
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<p>This file is telling you that the Linux net device eth0 maps to the first
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virtual LAN on the i5/OS which is VLAN0.</p>
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</div>
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</body>
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</html>
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