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Re: [Xen-devel] how to setup NAT for domU?



Gregor Milos wrote:

Gregor, in your xmexample script you have:

vif = [ 'ip=192.168.%d.1/24' % (vmid)]

The way the default setup (xmexample) works is as follows:
in domain 0 - vif gets ip = 192.168.vmid.1
in domU - eth0 gets ip = 192.168.vmid.2
this way we can easily update the routing tables in dom0. There can be up to 255 unprivileged domains (which is plenty).

OK, that's exactly what I wanted to do.

I have a much simpler config file, which has:

vif = [ 'ip=192.168.2.1/24']

This way all the virtual interfaces in dom0 would be getting the same ip, which will not work for more then one domU.
Actually I have a diferent file for each vmid, generated by bash scripts, with have a different 192.168.vmid.1, so I think our intent is the same, just different implemtations. My way was driven by my lack of python experience :)

...which I tried to use but I get an error from xm create.  Looking at

What is the error? Does it happen when you are trying to set up the first unprivileged domain or any subsequent ones. What IP address do you give to eth0 in domU?
I don't have the error recordred, but I think it was a python parsing error. Perhaps I just didn't get the format correctly. I cannot reproduce at the moment, because apparantly I have really screwed somthing up by trying the unstable tree, and so far I have not been able to get 2.0-testing or 2.0.1 running again (and 2.0.3 has always stuck at "Scrubbing memory.."). I'll try to get back where I started, 2.0.1 with the error reproduced. Hopefully it's just an error on my part. Thanks for your help!

-Andrew Theurer


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