Re: [Xen-users] Configuring xen bridges and networking issues

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Larry Ing wrote:
> I am trying to use bridged networking with my Xen VMs, but I am unable
> to connect them to the network.  I am running a Debian dom0 with Xen
> 4.0.1.  I am not seeing a xenbr0 interface in the output of "ifconfig",
> but I do see peth0 and eth0.  Running the command "brctl show" tells me
> that eth0 is the bridge device.  In my xend-config.sxp I did not name it
> eth0, but instead said the following "(network-script 'network-bridge
> antispoof=yes bridge=xenbr0')."  How do I create the xenbr0 interface
> and have my VMs successfully connect to this bridge?
Basically, forget the Xen bridge setup and let Debian do it. I think 
the Xen scripts are now acknowledged as possibly not the best in the 
world. Having looked at them, they seem terribly complicated for what 
little actually needs to be done.

In /etc/network/interfaces put this stanza :

iface eth0 inet static
  bridge_ports peth0
  address 192.168.x.y
  netmask 255.255.255.0
  gateway 192.168.x.z

This will automatically create a bridge called eth0 and make peth0 an 
interface bound to it.
In /etc/udev/rules.d/70-persistent-net.rules configure your interface 
to be named peth0 :
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", 
ATTR{address}=="xx:xx:xx:77:bc:9d", ATTR{dev_id}=="0x0", 
ATTR{type}=="1", KERNEL=="eth*", NAME="peth0"
In /etc/xen/xend-config.sxp, just make sure none of the 
network-script options are uncommented.
It should now "just work" - configure your guests to have a IVF on 
the bridge and that's it. If you have more than one interface, just 
rinse and repeat the above for each one. You do not have to use eth0, 
eth1, etc - I usually use something along the lines of ethext, 
ethbak, ethint, and so on so the names are easier to associate with 
networks (my hosts at work are connected to a minimum of 3 networks).
--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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