Re: [Xen-users] Xen & wifi connection

[Tim Post <tim.post@xxxxxxxxxxxxxxx>]

On Fri, 2007-01-19 at 13:05 +0000, Richard Jones wrote:
> I wonder if there are known issues with using Xen and a wifi
> connection instead of an ethernet connection?
> 
> I have 'network-bridge netdev=wlan0', and as soon as xend starts
> the wifi connection on Dom0 completely breaks.  Seems to be
> similar to these previously reported problems:
> 
> http://lists.xensource.com/archives/html/xen-users/2006-11/msg00635.html
> http://lists.linux-wlan.com/pipermail/linux-wlan-devel/2006-June/ 
> 003589.html
> 
> (but isn't the same as http://wiki.xensource.com/xenwiki/XenWifi)
> 
> I would like to help debugging this problem, but I'm not sure where
> to start so if anyone would like additional details of my config,
> please reply.
> 
> Xen 3.0.3 (from FC6), out-of-tree wireless driver from
> at76c503a.berlios.de, kernel 2.6.18-1.2869.fc6xen
> 
> Rich.
> 

You may do better better bringing up the bridge yourself in init.

You modify xend-config.xsp (in /etc/xen) to read:

(network-script network-dummy) , instead of network-bridge

Then create a file named /etc/xen/scripts/network-dummy with these
contents :

#!/bin/bash

exit 0

Save it, and chmod +x

Then bring up the bridge via the network init scripts. In Debian land
this would look like : (using your example)

auto xenbr0
iface xenbro inet static
        address x.x.x.x
        netmask x.x.x.x
        gateway x.x.x.x
        bridge_fd 0
        bridge_maxwait 0
        bridge_helo 0
        bridge_stp off
        bridge_ports wlan0

.. or if using dhcp

auto xenbr0
iface xenbr0 inet dhcp
        bridge_fd 0
        bridge_ ... (same as above)


This (should) do the trick.

If not using Debian (i.e. CentOS or FC4) it is a tad bit more difficult,
depending on what you're used to. I seldom work with bridged ethernet
networking outside of Debian (or forks thereof) systems, I usually end
up having to look up how to do it properly using the built in init
scripts ( /etc/sysconfig/network-scripts/ifcfg-* ), or just do it by
hand in a separate init script to keep it easy to tinker with and
remove.

Hope this helps.

Best,
--Tim


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