[Xen-users] Add independent interface from domU to internal bridge?

[Xenu13542 <xenu@xxxxxxxxxxxxxx>]

Hi,

I have what I believe is an elementary problem, but I haven't yet 
figured out the solution.
Within my domU host, I have a bridge named "net1". There is no routing 
performed between the real LAN and this bridge, intentionally. I have a 
virtual machine that connects to the bridge. It seems to work fine, (in 
fact I have several and I can bring them all up and they can communicate 
with each without incident).
My domU host has a single physical network interface which sits on my 
LAN and provides internet access for the domU host only (so I can send 
email, browse the web, etc, from domU).
What I don't understand is how to do is to add another, uh, virtual NIC 
that connects my domU host to the "net1" bridge that runs within it but 
that does not require connecting the LAN and the "net1" virtual bridge.
Nearly all the documentation I have read is written from the point of 
view where the virtual network will be routed to the LAN via domU. It 
always just works with the built-in scripts, everyone's happy. If I 
recall correctly, my implementation worked like this in the beginning, 
but ultimately in my case this is undesirable so I created my own 
bridges and altered the guest systems to utilize those. I deleted the 
bridges created by the xen scripts/distributions and disabled the built 
in DHCP/DNS server some time ago, because I want this to come from a 
virtual machine on the net1 bridge. DomU's role is to provide a virtual 
world to run in only, not services to the guest systems.
Other documents I've read suggest that I can achieve domU connectivity 
to the "net1" bridge by adding either the physical NIC or an alias of 
the physical NIC to the "net1" bridge using brctl. Anytime I manipulate 
the physical NIC in domU I lose LAN connectivity which is unacceptable.
I have tried enabling the dummy ethernet module via modprobe facilities 
but it seems to have no effect, or I don't know how to interact with it. 
(It's been a while since I worked this angle and I don't recall what I did.)
In at least one other document it seems that I could use `ip' to replace 
the dummy ethernet module using ip but it ultimately required an 
ethernet device. That seems to be precisely my problem, I don't have an 
ethernet device in this machine that isn't already busy doing something. 
Is that the answer? Must I have a separate physical ethernet device for 
every internal bridge that I want to connect to?
Trying to Google this problem is almost as frustrating as the problem. 
My attempts to search invariably match documentation for common setups 
which I don't appear to have.
For what it's worth, I'm running Fedora Core 8/Xen 3; 2.6.21-2950.fc8xen 
(supplied via the Fedora distribution)
Any direction that might help me resolve this problem is greatly 
appreciated.
Thanks,
Rich.

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users