Fix the problem with slow network bandwidth between VMs on the same
node. This problems appears when creating a lan of VMs on the same physical host, where the macvlan device is on top of a real ethernet interface. The BW was on the order of a 100s of Kbits, which is terrible. But crossing to a node on another physical host was fine. I eventually stumbled onto the fact that if the underlying device has tso/gso on, bw sucked. Just turning that off solved the problem. I have no idea why, just accept. Also turn off ipv6; some kind of unrelated kernel leak that was causing messages to the console, and I hate those while I type.
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