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
