Re: [Xen-users] question re xen bridging: how would I enable different names for xen bridge and dom0 ethernet interface?

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

Benjamin Weaver wrote:
> I have a 2-node xen cluster set up on 2 identical Linux Squeeze 
> boxes. An ifconfig on one of the boxes is shown below.
> The only bridge configuration on our system is this:
>
> (network-script 'network-bridge netdev=eth0')
>
> eth0 shows up as a bridge. A 'brctl showmacs eth0' indicates as 
> much. I would expect this, given my network-script line given above.
OK, look back (not too far) in the archives and you'll find plenty of 
advice to forget the Xen scripts (which I believe are being 
deprecated) and do it in the OS. Debian has good tools for setting up 
bridges, and all it takes is this in /etc/network/interfaces :
auto ethext
iface ethext inet static
  bridge_ports pethext
  address a.b.c.d
  netmask 255.255.255.0

You can rename your interfaces by editing 
/etc/udev/rules.d/70-persistent-net-rules
Note that the interfaces file does *not* have an entry for pethext.

> 1. Is eth0 in my configuration, both the dom0 logical interface and 
> the xen bridge? It would have to be, which I do not understand, 
> since I don't think a bridge can be an interface and vice versa.
Yes.
What you are missing is that you can treat a bridge as an interface, 
give it an IP address, and shunt packets through it. This is the 
normal way to set one up.
> 3. how would I configure the system so that the dom0 logical 
> ethernet interface is named differently from the xen bridge?
> 3a. how, for example, would I name my bridge xenbr0?
See above - I have a bridge called ethext, and a physical interface 
called pethext. These can be anything you want (within reason).
--
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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