[CentOS] Neighbour table overflow

Thomas Dukes tdukes at sc.rr.com
Fri Nov 28 02:25:09 UTC 2008



From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf
Of chloe K
Sent: Thursday, November 27, 2008 9:10 PM
To: CentOS mailing list
Subject: Re: [CentOS] Neighbour table overflow

what is your netmask? 
eth0 =
eth1 =
lo =
These don't look right except for eth1.  I have made no changes to these in
about 4 years.

Thomas Dukes <tdukes at sc.rr.com> wrote: 

Just started getting this. I tried the following by adding it to my

net.ipv4.neigh.default.gc_thresh1 = 4096
net.ipv4.neigh.default.gc_thresh2 = 8192
net.ipv4.neigh.default.gc_thresh3 = 8192
net.ipv4.neigh.default.base_reachable_time = 86400
net.ipv4.neigh.default.gc_stale_time = 86400

That pretty much locked things up. 

Then I tried another googled solution:

echo 256 > /proc/sys/net/ipv4/neigh/default/gc_thresh1

echo 512 > /proc/sys/net/ipv4/neigh/default/gc_thresh2

echo 1024 > /proc/sys/net/ipv4/neigh/default/gc_thresh3

And adding it also to etc/sysctl.conf:

net.ipv4.neigh.default.gc_thresh1 = 256
net.ipv4.neigh.default.gc_thresh2 = 512
net.ipv4.neigh.default.gc_thresh3 = 1024

Still not working.

Any ideas?


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