Xen users - Feb 2006 - Another "how do i" question regarding networking and server consolidation...

Hello --

I''ve been watching this mailing list and trying to find documentation
to do server consolidation using xen. Specifically:

I have:
Machine A at ip address x.y.z.10 and Machine B at ip address x.y.z.11

I want:

Xen domain 0 at ip address x.y.z.50, Domain U1 at ip x.y.z.10 and
Domain U2 at x.y.z.11 using (preferably) only one physical ethernet
NIC (in the old days there was ip aliasing to do this) such that (as
far as the rest of the network is concerned) they think there are
three machines, but there is really only the one physical Xen machine
with two guests. Is this possible with Xen and brctl?

And if so, anyone have any suggestions? Nearly everything I''ve read
assigns an ip address to the bridge and then does some form of
nat/route/vpn/vnet to the guest domains (to make the outside world
think there is only one machine). How do you make the outside world
think there are multiple machines?

Thanks!

-- charles

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On Wednesday 08 February 2006 18:14, Charles Spirakis
wrote:
> Hello --
>
> I''ve been watching this mailing list and trying to find
documentation
> to do server consolidation using xen. Specifically:
>
> I have:
> Machine A at ip address x.y.z.10 and Machine B at ip address x.y.z.11
>
> I want:
>
> Xen domain 0 at ip address x.y.z.50, Domain U1 at ip x.y.z.10 and
> Domain U2 at x.y.z.11 using (preferably) only one physical ethernet
> NIC (in the old days there was ip aliasing to do this) such that (as
> far as the rest of the network is concerned) they think there are
> three machines, but there is really only the one physical Xen machine
> with two guests. Is this possible with Xen and brctl?
>
> And if so, anyone have any suggestions? Nearly everything I''ve
read
> assigns an ip address to the bridge and then does some form of
> nat/route/vpn/vnet to the guest domains (to make the outside world
> think there is only one machine). How do you make the outside world
> think there are multiple machines?
Just use the default bridging config xen comes with.
It makes the outside world think that there''s an additional switch/hub
at the
end of your network cable, with dom0 + domU + domU + ... attached to it.

(bridge and physical eth0 run without IP adress, all domains (including dom0) 
are attached to the bridge with "virtual network cables", the
vif->veth
pairs)

/Ernst

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