Re: [Xen-users] Has anyone successfully configured Xen to work with...

[Andy Smith <andy@xxxxxxxxxxxxxx>]

On Wed, Dec 07, 2005 at 12:40:17AM -0800, Bill Kelly wrote:
> Hi,
> 
> Has anyone successfully configured Xen to work with a server having:
> 
> 1 NIC.
> Multiple IPs.  (e.g. 69.93.218.2, 69.93.218.3, 69.93.218.4, ...)
> dom0 using one IP.  (e.g. 69.93.218.2)
> domU using another IP.  (e.g. 69.93.218.3)

This is a fairly normal config when bridging, since the eth0 and all
vifs are going to be on the same layer 2 network they can all take
addresses from the same network.

Paste output of:

ifconfig -a
brctl show
ip ro

For example:

eth0      Link encap:Ethernet  HWaddr 00:E0:81:64:1D:07
          inet addr:212.13.198.69  Bcast:212.13.198.255  Mask:255.255.255.224

xen-br0   Link encap:Ethernet  HWaddr 00:E0:81:64:1D:07
          inet addr:212.13.198.69  Bcast:212.13.198.255  Mask:255.255.255.255

$ brctl show
bridge name     bridge id               STP enabled     interfaces
xen-br0         8000.00e081641d07       no              eth0
                                                        vif-struggler.0
$ ip ro
212.13.198.64/27 dev xen-br0  proto kernel  scope link  src 212.13.198.69
default via 212.13.198.65 dev xen-br0

and in the domU connected to vif-struggler.0:

eth0      Link encap:Ethernet  HWaddr AA:00:00:4B:A0:C1
          inet addr:212.13.198.70  Bcast:212.13.198.255  Mask:255.255.255.224

212.13.198.69/27 and 212.13.198.70/27 are obviously both on the same
layer 2 network (212.13.198.64 -> 212.13.198.95), nothing special
needed to be done to make the bridging work.

Make sure you aren't adding the IP of your domU to any interface in
dom0.

Andy

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