[DRBD-user] CentOS, eth0, eth1 and arpwatch flip flops

David Coulson david at davidcoulson.net
Sat Jan 5 01:59:58 CET 2013


Why not just put eth1 on a different vlan?

Sent from my iPad

On Jan 4, 2013, at 7:49 PM, Gavin Henry <gavin.henry at gmail.com> wrote:

>> Has anyone experienced this whilst running DRBD over eth1 between two
>> CentOS 5.7 servers?
>> 
>> eth1 is a private IP address, unroutable. eth0 is the public address.
>> CentOS will reply sometimes once every 3 days or every 14mins~ saying
>> "My public IP is on eth1" to arp requests when it's not, it's eth0.
>> 
>> This freezes traffic and causes issues. We've looked at arp*
>> /etc/sysctl.conf etc. and arptables, but wondered if anyone had a
>> recipe?
>> 
>> We have this already which didn't help as it happened Christmas Eve
>> too as we kept eth1 up for a few days to test:
>> 
>> # For the dual interface - 06.12.12
>> net.ipv4.conf.eth0.arp_filter = 1
>> net.ipv4.conf.eth0.arp_ignore = 1
>> net.ipv4.conf.eth1.arp_filter = 1
>> net.ipv4.conf.eth1.arp_ignore = 1
>> net.ipv4.conf.all.arp_filter = 1
>> 
>> 
>> eth0 and eth1 are on the same VLAN/broadcast domain, but eth1 is a
>> 169.xx and eth0 is a routable public IP.
>> 
>> We're having to shut eth1 down and bring it up for sync at night.
>> 
>> Thanks,
>> 
>> Gavin.
> 
> Couldn't get this to work so have had to bin DRBD. Shame.
> 
> Thanks.
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