Re: What does "Neighbour table overflow" message indicate?

[Eric W. Biederman]

> Further snooping shows the error msg text in file inux/net/ipv4/route.c:
> 
>     if (net_ratelimit())
>         printk("Neighbour table overflow.\n");

> 
> The reference to "net_ratelimit" make me wonder if it is related to 
> iptables.  I am using iptable, and have since kernel 2.4.1, but I've seen 
> these messages before.  Hmmm.

My experience with this is the message occurs when you a machine starts
arping for a non-existent ip address.  I suspect net_ratelimit triggers
when there are too many arps.

Run tcpdump -n -i eth0 (assuming your network is on eth0) and see if you
see an arp request that never gets answered.

Eric