198 lines
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HTML
198 lines
7.3 KiB
HTML
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<TITLE>The Answer Gang 65: neighbour table overflow</TITLE>
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<H4>By Jim Dennis, Ben Okopnik, Dan Wilder, Breen, Chris, and the Gang,
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and You!
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<br>Send questions (or interesting answers) to
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif"
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height="50" width="60" alt="(?) " border="0"
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>neighbour table overflow</H3>
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<p><strong>From Berg Alexander
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</strong></p>
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<p align="right"><strong>Answered By Heather Stern
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<br></strong></p>
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<P><STRONG>
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hi,
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</STRONG></P>
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<P><STRONG>
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i have the problem that i have a running terminal-server (booting
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over net via Root-NFS) system. now we want to add a second subnet to the
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server, and all should be okay in the config files. BOOTP is working,
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TFTP is working but the client is not able to mount the root-fs, with the
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error message "neighbour table overflow"... we also have changed the
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nfs-server, no luck...
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</STRONG></P>
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<P><STRONG>
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bye
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</STRONG></P>
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<P><STRONG>
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Alexander Berg
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</STRONG></P>
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<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" ALT="(!)"
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HEIGHT="28" WIDTH="50" BORDER="0"
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> [Heather]
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The message 'neighbor table overflow' is not about your NFS, it's at a
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lower layer than that.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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It means that your arp cache is overflowing because your machine can't
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tell who is on its own subnet... its neighbors. Which usually means your
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localhost setup is broken (because lots of applications use networking
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internal to your machine - which is <EM>always</EM> on its own subnet, so those
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packets should never even escape the computer) or, far less commonly,
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that your netmask for your own external address is wrong.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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Sadly, tftp and network booting are things I'm not so familiar with, so
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perhaps one amongst the rest of The Answer Gang can help tell you where
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to correct your terminals' localhost setup.
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</BLOCKQUOTE>
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<BLOCKQUOTE>
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Because this happened when you're adding a new subnet, you may find a need
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to set up machines on both subnets with ethernet aliases. When properly
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set up then running ifconfig should result in something like this:
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</BLOCKQUOTE>
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<blockquote><pre>eth0 Link encap:Ethernet HWaddr so:me:he:xv:al:ue
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inet addr:192.168.129.15 Bcast:192.168.129.255 Mask:255.255.255.0
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UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
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RX packets:5939693 errors:0 dropped:0 overruns:0 frame:0
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TX packets:5971444 errors:0 dropped:0 overruns:0 carrier:0
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collisions:8308 txqueuelen:100
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Interrupt:10 Base address:0xff00
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eth0:1 Link encap:Ethernet HWaddr di:ft:he:xv:al:ue
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inet addr:192.168.64.2 Bcast:192.168.64.255 Mask:255.255.255.0
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UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
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Interrupt:10 Base address:0xff00
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lo Link encap:Local Loopback
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inet addr:127.0.0.1 Mask:255.0.0.0
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UP LOOPBACK RUNNING MTU:3924 Metric:1
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RX packets:320906 errors:0 dropped:0 overruns:0 frame:0
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TX packets:320906 errors:0 dropped:0 overruns:0 carrier:0
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collisions:0 txqueuelen:0
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</pre></blockquote>
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<BLOCKQUOTE>
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Best of luck!
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</BLOCKQUOTE>
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<p><em>
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note, Alexander put antispam hooks in his address when mailing us,
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so he never saw his emailed response. We still hope this helps him and
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others with the dreaded Neighbour Overflow.
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</em></p>
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<H5 align="center">This page edited and maintained by the Editors
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of <I>Linux Gazette</I>
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<a href="http://www.linuxgazette.com/copying.html"
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>Copyright ©</a> 2001
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<BR>Published in issue 65 of <I>Linux Gazette</I> April 2001</H5>
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<H6 ALIGN="center">HTML script maintained by
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<A HREF="mailto:star@starshine.org">Heather Stern</a> of
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Starshine Technical Services,
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