Xen users - Jan 2008 - Help needed configuring HVM domU with routed networking

I''m running CentOS 5.1 with all current updates:

xen-libs-3.0.3-41.el5
xen-3.0.3-41.el5
kernel-xen-devel-2.6.18-53.1.4.el5
kernel-xen-2.6.18-53.1.4.el5

and have a domU config file from another server which works.  The
difference is that on this machine I want to use routed rather than
bridged networking.  In bridging mode the domU works fine, but I
can''t use bridging on this particular server.

I have modified /etc/xen/config.sxp, commenting out

  (network-script network-bridge)
  (vif-script vif-bridge)

and uncommenting

  (network-script network-route)
  (vif-script     vif-route)

I''ve also changed the vif line in the domU config file to:

  vif = [ ''ip=aaa.bbb.ccc.ddd, vifname=veth1'' ]

The domU now boots, but has no eth0 interface (the driver doesn''t load
in the domU because it can''t find a suitable device).

Is there anything obvious I might have done wrong or missed out?  There
are no obvious ethernet-related errors in the logs.

Thanks,
James

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