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

From: Eric W. Biederman (
Date: Sun Jul 29 2001 - 04:08:13 EST

> 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.

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This archive was generated by hypermail 2b29 : Tue Jul 31 2001 - 21:00:40 EST