Steve Wise wrote:
Guys, this reminds me of an issue we have with rnics and regular nics on
the same physical network. By default linux responds to arp queries on
all ports it receives the query on. This leads to very bad results with
you're trying to do offloaded connections. When resolving the
address/route, the rdma client can end up getting the mac address of the
dumb nic instead of the rnic. I don't know if route resolution in the
ib cm has this issue, but it might since they use ipoib for some part of
the resolution, no?
I think this could be the problem. (And could have taken me a long time
to figure it if it is, so thanks!)
2) If you have a multi-homed host and the physical ethernet networks are
bridged, then you need to configure arp to only send replies on the
interface with the target ip address:
sysctl -w net.ipv4.conf.all.arp_ignore=2
Sundeep, can you try this and see if it fixes the problem for you?
- Sean
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