[Xen-users] Bridge networking in Debian

[James Triplett <jm-xenusers@xxxxxxx>]

Starting a new Xen setup, with off-the-shelf Wheezy, and the standard Xen 
packages,
which turn out to be Xen 4.1

I used to just put a  (network-script network-bridge) in the Xen setup, but I 
guess
you can't do that anymore...

There are a variety of recipes to setup the network and bridging, since 
apparently
the Xen setup doesn't does this for you anymore.  I've gone through a couple
tries, with no success so far.

Following instructions in /usr/share/doc/xen-utils-common/README.debian,
I created a /etc/network/interfaces file like this:

     auto br0 
     iface br0 inet static 
     address 192.168.0.26
     network 192.168.0.0
     netmask 255.255.255.0
     broadcast 192.168.0.255
     gateway 192.168.0.1
     bridge_ports all

When the machine reboots, I see:
    br0 Link encap:Ethernet  HWaddr 00:1e:4f:11:51:5f
        inet addr:192.168.0.26  Bcast:192.168.0.255  Mask:255.255.255.0
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
        RX packets:2174 errors:0 dropped:0 overruns:0 frame:0
        TX packets:531 errors:0 dropped:0 overruns:0 carrier:0
        RX bytes:316591 (309.1 KiB)  TX bytes:67600 (66.0 KiB)

    eth0      Link encap:Ethernet  HWaddr 00:1e:4f:11:51:5f
        inet addr:192.168.0.104  Bcast:192.168.0.255  Mask:255.255.255.0
        UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
        RX packets:2601 errors:0 dropped:0 overruns:0 frame:0
        TX packets:648 errors:0 dropped:0 overruns:0 carrier:0
        RX bytes:508220 (496.3 KiB)  TX bytes:84048 (82.0 KiB)
        Interrupt:16 Memory:f8000000-f8012800

So, the eth0 physical interface somehow picked up .104, likely from DHCP-
but I don't know why.

And I get wierd ping responses.  A ping on the local network works fine, but 
try 
to move out to the next network yields:

    james@puerto:/usr/share/doc/xen-utils-common$ ping 192.168.1.4
    PING 192.168.1.4 (192.168.1.4) 56(84) bytes of data.
    From 192.168.0.104 icmp_seq=1 Destination Host Unreachable
    From 192.168.0.104 icmp_seq=2 Destination Host Unreachable

The ICMP reply comes from the .104 address?  ???


Does anyone know the correct configuration in /etc/network/interfaces for
a dead-simple bridge to support Xen domU's?

thanks!

James



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