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