Agree in all points. Thanks for the information. I'll give the patch a try.
Tim Sent from my iPhone On Sep 20, 2013, at 1:26 PM, Stefan Hajnoczi <stefa...@gmail.com> wrote: > On Fri, Sep 20, 2013 at 11:48:50AM -0400, Tim Epkes wrote: >> The problem aI face is that a bridge in the middle ( using taps) breaks >> LLDP ( L2 discovery protocol) and should break ISIS as well. Sockets >> aren't bad, but if for some reason I take the listener VM down and bring >> back up, then I have to bring down all connector VMs, which chains on >> itself if there is a lot of connectivity defined. When UDP was available >> that wasn't an issue. > > I just checked linux.git but this patch has not been applied (although > it's trivial if you're willing to rebuild your kernel from source): > http://comments.gmane.org/gmane.linux.network/208908 > > It sounds like improving net/socket.c might be the right place to look. > >> Anyway, that is how I came to VETHs. I am aware that you can use UDP >> multicast, but performance past one hop is extremely poor ( resulting in 3 >> of 5 pings to be lost. Thanks > > Unfortunately the veth driver does not hand Ethernet frames to/from > userspace. We really need something tap-like where userspace can > inject/extract packets. > > Stefan
