Xen users - Jul 2011 - Issues starting xend when using network-nat and vif-nat Debian

I am using Debian Squeeze with Xen 4.0.1 and Xen tools 4.1.1.  The
reason I am using Xen tool 4.1.1 is that Debian''s Xen-tools has a bug
where it is missing hotplugpath.sh and is therefore unable to use
network-routes and network-nat in the xend-config.sxp file.  So I
scouted around Debian''s bug with a newer xen-tools and tried using 
(network-script network-nat) and (vif-script vif-nat).  Now I get the
following when doing "/etc/init.d/xend start:"
http://pastebin.com/NiHrkMv7 .  If I switch back to using
(network-script network-bridge) and (vif-script vif-bridge), xend seems
to start because no errors are displayed when running "/etc/init.d/xend
start," but I am unable to connect to the hypervisor. 

On a side note, before having used (network-script network-bridge) and
(vif-script vif-bridge),  My VMs under Xen were unable to connect to the
network.  While the VMs were running, I did see extra interfaces under
ifconfig that did seem to be bridges for the VMs.

Does anyone have a solutions as to how I can get NAT networking to run
with Xen or how I can revert back to the bridge method and successfully
use it?




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On Thu, Jul 28, 2011 at 01:18:30PM -0700, Larry Ing
wrote:
> I am using Debian Squeeze with Xen 4.0.1 and Xen tools 4.1.1.  The
> reason I am using Xen tool 4.1.1 is that Debian''s Xen-tools has a
bug
> where it is missing hotplugpath.sh and is therefore unable to use
> network-routes and network-nat in the xend-config.sxp file. 
>
You should never mix different hypervisor <-> tools versions like that.

> So I scouted around Debian''s bug with a newer xen-tools and tried
using
> (network-script network-nat) and (vif-script vif-nat).  Now I get the
> following when doing "/etc/init.d/xend start:"
> http://pastebin.com/NiHrkMv7 .  If I switch back to using
> (network-script network-bridge) and (vif-script vif-bridge), xend seems
> to start because no errors are displayed when running
"/etc/init.d/xend
> start," but I am unable to connect to the hypervisor. 
> 
> On a side note, before having used (network-script network-bridge) and
> (vif-script vif-bridge),  My VMs under Xen were unable to connect to the
> network.  While the VMs were running, I did see extra interfaces under
> ifconfig that did seem to be bridges for the VMs.
> 
Extra interfaces? what do you mean?
> Does anyone have a solutions as to how I can get NAT networking to run
> with Xen or how I can revert back to the bridge method and successfully
> use it?
> 
Bridge should work without any extra steps.
You should probably create the bridges using distro network scripts,
and not have any network-script defined in xend-config.sxp.

See: http://wiki.xen.org/xenwiki/HostConfiguration/Networking

vif-script should be vif-bridge, unless you specify it for every VM for every
vif.

-- Pasi


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