Github user dsclose commented on the pull request: https://github.com/apache/cloudstack/pull/1519#issuecomment-217110131 Currently I'm investigating @ustcweizhou suggestions above. He's quite correct about not adding the mark for eth0 and I think I've reproduced the problem he reported on NICs higher than eth3. Once we trigger the creation of eth4, the routing table Table_eth4 gets added multiple times - but only once with the fwmark limitation. This prevents any traffic being routed correctly on the VR - even to the point of not being able to connect to it from the HV. @swill @rhtyd - I'll squash and force push this soon. I want to incorporate the snippets given by @ustcweizhou and verify that they work first.
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