Re: xen networking and tap0

[brook%biology.nmsu.edu@localhost (Brook Milligan)]

Manuel Bouyer writes:
 > On Fri, Jan 22, 2010 at 11:26:57AM -0500, der Mouse wrote:
 > that's not completely true; tap interfaces can be used without controlling
 > processes. The kernel should still be able to use it as a regular
 > interface for bridging purposes (it would behaves like a real
 > ethernet device without the cable plugged in).

And that is supported by the fact that it seems to work that way if
the domU interface is statically assigned.  For example, ping and ssh
connections to the dom0 from the domU work fine.  However, the domU
dhcp requests are not being seen by the dom0.  The dom0 tcpdump
recognizes the requests on tap0 but there are no responses:

11:32:25.016539 IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request 
from 00:16:3e:00:00:12 (oui Unknown), length 300

So, why does the bridging not work for dhcp requests when it does seem
to work for at least some other packets?

Cheers,
Brook