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

[Karl Pielorz]

--On 18 February 2015 14:49 -0500 Michael MacLeod <mikemacleod at gmail.com> 
wrote:

> I've been using the OSS Xen releases for years, and have never been able
> to get PVM domU to be functional as a gateway - I've either had to use
> HVM or setup a separate box as the router. This has been the case since
> at least FBSD8 I think, or whenever XENHVM became an option.

As the original bug filer...

I've tried FBSD 9, 10 and 11 - I was hoping (under the "you never know" 
banner) that XS 6.5 with updated Xen etc. might make a difference - but 
sadly it doesn't, as people have pointed out - it's a likely issue with 
netfront/back code in FBSD.

This is a real pain for us - apart from the hours initially wasted figuring 
it out - and the 'accidents' when people forget, we either have a bunch of 
non-agile machines polluting our main pools, or a secondary "pool of shame" 
where all the FBSD boxes that do things like VPN, routing, DHCP, 
firewalling are running in HVM mode [and again, not agile]. Performance of 
HVM NIC's and  disk isn't as good as PV either (as you'd expect).

I have the stuff to test this setup in house here - I just don't know where 
to start to look at it :( - but open to suggestions ;)

Cheers,

-Karl