Crazy network problem (solved!)
gabe at gundy.org
Sat Apr 21 10:52:27 MDT 2012
On Sat, Apr 21, 2012 at 8:40 AM, Steve Meyers <steve-plug at spwiz.com> wrote:
> So why was the checksum wrong? It turns out that the virtio driver in
> C6 has some optimizations in it. It waits until a packet actually hits
> the wire to calculate the checksum. Internally to the physical host, it
> never bothers -- since it's never going on the wire, it doesn't
> calculate it or check it. The problem was that OpenVPN was sending
> those bad packets to my home network without fixing the checksum, since
> they never hit the physical machine's NIC.
Thanks for sharing! It sounds like you should be able to choose a
different driver and avoid moving this to a physical host, right? If
so, why not do that?
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