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I actually liked the arptables method (have used the iptables one too
which also works well but the arptables one is better for performance).
I wonder if the sysctl method is better for performance than the
arptables one (I suspect it doesn't matter unless you're maxing out your
hardware). I think the sysctl method is more dependent on how your
interfaces are set up than the arptables method though?
-h
--
Hari Sekhon
http://www.linkedin.com/in/harisekhon
Jon Gray wrote:
> Actually I just finished reading
> http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.arp_problem.html
> about 5 minutes before your reply and applied the following to my
> sysctl.conf:
>
> net.ipv4.conf.eth0.arp_ignore = 1
> net.ipv4.conf.eth0.arp_announce = 2
> net.ipv4.conf.all.arp_ignore = 1
> net.ipv4.conf.all.arp_announce = 2
>
> And now it seems to be working again. Thanks for the quick reply Graeme!
>
>
> Graeme Fowler wrote:
>
>> On Fri, 2009-08-28 at 08:35 -0400, Jon Gray wrote:
>>
>>
>>> We recently moved to a new data center and both of our load balancers
>>> are now exhibiting some strange behavior.
>>>
>>>
>> ...which sounds to me very much like "The ARP Problem".
>>
>> One of your realservers is sending out ARP replies for the VIP and ends
>> up handling all the traffic directly, alone.
>>
>> There are many ways to solve this - the best way being to use
>> appropriate sysctls. This is documented in the HOWTO, and on
>> linuxvirtualserver.org.
>>
>> Graeme
>>
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