[CentOS] Neighbour table overflow

Robert Moskowitz rgm at htt-consult.com
Fri Nov 28 03:24:01 UTC 2008


Thomas Dukes wrote:
>  
>
> *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 = 255.255.240.0

That is 4096 addresses (256*16).

> eth1 = 255.255.255.0
> lo = 255.0.0.0

lo is correct.  The 'whole' net127.  Of which 4 addresses have ever been 
used (that I have encountered)....

>  
> These don't look right except for eth1.  I have made no changes to 
> these in about 4 years.
>  
> Thanks  
>
> */Thomas Dukes <tdukes at sc.rr.com>/* 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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