I submitted a PR a while ago (pr188261) - or now, Bugzilla <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188261>

I've updated this recently - as I found doing 'ifconfig xn0 -txcsum' on a "client" will fix the issue, for just that client - but I'm still unable to fix the 'router' VM in such a way as all clients don't need a fix.

I have a test system setup with all this now (and all of 9.2-S, 10-S, and 11-Current have the issue) - is anyone able to point me in the right direction of what I can do to investigate this further? (i.e. debug things, packet captures, etc. etc.)

We could really do with getting this fixed - we use FreeBSD as routers on a few systems - as as they move to Xen we end up having to either setup 2 pools (and be very, very careful about what machines we put on each) in order to avoid this - or face running them in HVM mode for which the performance is very, very poor.

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