[Bug 188261] [xen] FreeBSD DomU PVHVM guests cannot 'route' traffic for other Xen PV guests on same Dom0 Host.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188261

--- Comment #34 from karl at pielorz.com ---
(In reply to Eitan Adler from comment #33)

Hi - this issue still exists, I've just re-tested in 10.4 and 11.1. I'm not
able to test 12.x at the moment, but I have no reason to believe it's been
fixed in current or anything.

It affects anything working with 'low level' packets - so NAT, OpenVPN, DHCP
et'al. - e.g. with OpenVPN it seems packet coalescing 'behind the scenes' ends
up presenting  way over 1500 byte packets to OpenVPN - which it point blank
refuses to handle.

Workaround we're using here is to set 'hw.xen.disable_pv_nics=1' in
/boot/loader.conf on FreeBSD with a small mod to 'qemu-dm-wrapper' on the Xen
Server, and a custom field added to affected VM's in XenCenter that the wrapper
'keys off' - this turns xn0 into vtnet0 for these hosts - these do work with
the above applications, and are still live-migratable (and appear to be better
performance than re0 NIC's).

-Karl

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