Hello,
While testing iptables, I came across the following
error messages in the /var/log/messages file:
Jun 6 04:36:50 fw kernel: Neighbour table overflow.
Jun 6 04:36:51 fw kernel: Neighbour table overflow.
Jun 6 04:36:53 fw kernel NET: 18 messages suppressed.
Jun 6 04:36:53 fw: Neighbour table overflow.
Jun 6 04:37:42 fw kernel NET: 15 messages suppressed.
Jun 6 04:37:42 fw: Neighbour table overflow.
Jun 6 04:37:43 fw last message repeated 8 times
Jun 6 04:37:43 fw kernel NET: 2 messages suppressed.
Jun 6 04:37:43 fw kernel: Neighbour table overflow.
Jun 6 04:37:48 fw kernel NET: 22 messages suppressed.
Jun 6 04:37:48 fw: Neighbour table overflow.
Jun 6 04:37:54 fw kernel: NET: 6 messages suppressed.
Jun 6 04:37:54 fw kernel: Neighbour table overflow.
Jun 6 06:01:25 fw kernel: NET: 4 messages suppressed.
I am using Redhat Linux 2.4.18-14smp on a HP Netserver
LP 1000R, dual 1.13 GHz Pentium III processors with
512Mb of RAM and 20 GB Hard Drive and the iptables
implementation included with the OS. I am assuming the
hardware, and kernel version are appropriate for
iptables to run comfortably.
A search on google indicats that such errors can be
caused if the loopback interface is mis-configured or
is 'down'. However, I have checked to make sure that
the loopback interface was 'up' and had the standard
configuration. Some posts indicated that this error
can be caused due to arp handling problems in earlier
version of Linux (which should not be an issue with
the 2.4 kernel ?).
I have tried various combination of iptables setup,
such as loading and unloading the different modules it
used (without loading any iptables rules), watching
the logs with ip forwarding enabled/ disabled
(/proc/sys/net/ipv4/ip_forward) etc for the sake of
eliminating my ruleset or any of my configuration
options as the cause. The error appears sporadically,
but I the pattern I have noticed is that anytime ip
forwarding is enabled, the arp cache starts filling up
and these error eventually appear (even in the absense
of any iptables). I have configured iptables according
to the tutorials at netfilter.org with additional
rules to suit my environment.
I know this issue has been discussed much on the
Internet, however, none of the suggested solutions are
helping in my case. I would truly appreciate any
input/ suggestions on this issue.
Thanks,
Divyangi
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