Hi, Again I'd say search google for "Neighbour table overflow". Short answer is If you get message "Neighbour table overflow." in dmesg then you need to increase ARP related parameters as following. It is good to set in rc.local or via sysctl . All are in /proc/sys/net/ipv4/neigh/default/ directory. "Desired" indicate to set value when you encounter problem. This is normally suggest double of your existing value and it is in power of 2. gc_thresh1 The minimum number of entries to keep in the ARP cache. The garbage collector will not run if there are fewer than this number of entries in the cache. Defaults to 128. Desired: 256 gc_thresh2 The soft maximum number of entries to keep in the ARP cache. The garbage collector will allow the number of entries to exceed this for 5 seconds before collection will be performed. Defaults to 512. Desired: 1024 gc_thresh3 The hard maximum number of entries to keep in the ARP cache. The garbage collector will always run if there are more than this number of entries in the cache. Defaults to 1024. Desired: 2048 gc_stale_time Determines how often to check for stale neighbour entries. When a neighbour entry is considered stale it is resolved again before sending data to it. Defaults to 60 seconds. Desired: 120 Hope no complains again. -- Sumit ----- Original Message ----- From: "Bartosz Feński aka fEnIo" <fenio@o2.pl> Sent: Thursday, July 24, 2003 7:09 PM On Wed, Jul 23, 2003 at 08:48:19PM +0200, Bartosz Fe=F1ski aka fEnIo wrote: > Whell... it happened. >=20 > Jul 23 07:51:42 localhost kernel: MASQUERADE: No route: Rusty's brain bro= ke! > Jul 23 07:51:43 localhost kernel: MASQUERADE: No route: Rusty's brain bro= ke! > Jul 23 07:51:44 localhost kernel: MASQUERADE: No route: Rusty's brain bro= ke! >=20 > (root@rtr)/var/log$grep Rusty syslog | wc -l > 136451 > (root@rtr)/var/log$ >=20 > And it seems that it's quite often. >=20 > Can you tell me what else should I tell you to help debug that problem? Ok... I've got one anwer, and someone asked me to read netiquette and search the Google. I searched before I wrote here. (root@rtr)~$cat /proc/sys/net/ipv4/ip_conntrack_max=20 131072 (root@rtr)~$ (root@rtr)~$cat /proc/net/ip_conntrack | wc -l 23331 (root@rtr)~$ And I still have in my logs: Jul 24 15:32:37 localhost kernel: NET: 169 messages suppressed. Jul 24 15:32:37 localhost kernel: Neighbour table overflow. Jul 24 15:32:37 localhost kernel: MASQUERADE: No route: Rusty's brain broke! - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html