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

Eric W. Biederman (ebiederm@xmission.com)
29 Jul 2001 03:08:13 -0600


> 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
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