Question About Neighbour Table Overflow.

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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.

some forum saied:
They are probably realted to a kernel bug where the thresholds are in fact only half of the value that is set. See http://patchwork.ozlabs.org/patch/170385/

One thought on - Question About Neighbour Table Overflow.

  • 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

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