Re: neighbor table overflow

Linux Advanced Routing and Traffic Control

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Marco C. Coelho wrote:
> I've got a linux router pushing 600-1000 pppoe connections through
> it.  I'm getting a screen error "Neighbor Table Overflow" after this
> box has been up for between 1 week and 1 month.  When this is
> happening, routing slows to a crawl if at all.  Then dies.  I've added:
>
> # Added to stop "neighbor table overflow" messages in the kernel
> net.ipv4.neigh.default.gc_thresh1=512
> net.ipv4.neigh.default.gc_thresh2=2048
> net.ipv4.neigh.default.gc_thresh3=4096
> # Added to increase IP contrack number (was getting to max)
> net.ipv4.ip_conntrack_max=99999
>
> to sysctl.conf to increase the size, but this only seems to delay the
> problem.
>
> Any thoughts?
>
> Marco
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What about checking your routing table? you may have link routes for
massive subnets (like 85.0.0.0/8 or 140.20.0.0/16). Some programs prefer
to use "standard" netmask of classes A and B.


# ip rou |grep link
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