Re: [CentOS] Question about Neighbour Table Overflow.

On Thu, Jan 08, 2015 at 11:38:46PM +0800, zhen wang wrote:

Hi, all

When use Centos 6.5,kernel version 2.6.431, I have continuous messages of "Neighbour table overflow" in messages. I have modified the gc_thresh1(512) , gc_thresh2 (2048) gc_thresh3 (4096) in /proc/sys/net.. path, But the messages occurs occasionally.

We had 1,500 machines in our colo when I did this to stop those complaints:

# increase the size of the neighbor tables to be more than the # of ips in the colo net.ipv4.neigh.default.gc_thresh1 = 2048 net.ipv4.neigh.default.gc_thresh2 = 2304 net.ipv4.neigh.default.gc_thresh3 = 2560

-- greg