netdev - bonding ALB multihomed IP ARP problem

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Date:	Tue, 7 Oct 2008 11:12:03 -0400
From:	"Dan Wong" <dwd178@...il.com>
To:	netdev@...r.kernel.org
Subject: bonding ALB multihomed IP ARP problem

>From tcpdump I'm seeing a slave interface reponding to arp request for
a downed multihomed/alias  IP
I've tried bonding mode 0 round robin loading balancing and the
problem doesn't occur.
I'm running RHEL5U1 and using Channel Bonding Driver v3.1.2
Steps to reproduce problem.
1) Setup two servers, server A and B, with bonds mode 6 ALB with
different IP addresses, each bond containing 2 slaves
2) Create Aliases i.e. bond0:1 on server A and B with same Ip addresses
3)  execute the following in loop
     ssh serverA ifdown bond0:1; sleep 5; ssh serverB ifup bond0:1
     sleep 5
     ssh serverB ifdown bond0:1; sleep 5; ssh serverA ifup bond0:1
     sleep 5
After a few iterations, duplicate ip address detected. I've increased
the sleep interval to 30 seconds and still have same problem.
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