Re: neighbor table overflow

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On 10/23/07 06:56, Alexandru Dragoi wrote:
What about checking your routing table? you may have link routes for massive subnets (like or Some programs prefer to use "standard" netmask of classes A and B.

I'm betting that the OP has other things going on seeing has how s/ he mentioned PPPoE, which to my knowledge is a layer 2 protocol, and thus not subject to typical routing scenarios. In essence the OP could have thousands of PPPoE connections terminating on one system with the ARP cache having to deal with where to send traffic to which MAC address. There is not a lot of room for routing in such a scenario.

I agree with Peter's suggestion, arpd. I ran into the neighbor table overflow problem recently, at the hands of our ISP. I was in the process of recompiling the kernel and mucking with arpd (I couldn't get it to run/start properly) when the problem disappeared as quickly as it showed up. Lucky for me, this was some kind of ISP problem, I was able to determine that much through `tcpdump -i X -n arpd`.

My 'two cents' is that you try arpd, I did a bit of looking when I came across that problem and it seemed to be the last ditch effort when changing the gc threshold had no effect. Wasn't able to confirm that it worked for sure though.

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