Thomas Dukes wrote:
*From:* centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx]
*On Behalf Of *chloe K
*Sent:* Thursday, November 27, 2008 9:10 PM
*To:* CentOS mailing list
*Subject:* Re: Neighbour table overflow
what is your netmask?
eth0 = 255.255.240.0
Why do you have such a large subnet? There are a number of potential
performance problems with such a setup. I typically only see this in
large, bridged wireless campuses. Little justification for it in a
wired network. (I do have lots of networking experience and knowledge,
having consulted with a number of large deployments).
Even with a large subnet, you should not be arping everywhere. Either
two things are happening:
Your system is recording every ARP request it sees ('Who has IP
x.x.x.x') to avoid arping later. Bad behaviour (IMNSHO), given your
network.
Your system is ARPing for every IP address in the subnet to learn all of
its neighbors. WHy would it do that? Unless you have some snooping
software running on your system.
eth1 = 255.255.255.0
lo = 255.0.0.0
These don't look right except for eth1. I have made no changes to
these in about 4 years.
Thanks
*/Thomas Dukes <tdukes@xxxxxxxxx>/* wrote:
Just started getting this. I tried the following by adding it to my
etc/sysctl.conf:
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?
TIA
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