[Gllug] Xen and bridging

[Adrian McMenamin]

On Tue, May 16, 2006 1:14 pm, Daniel P. Berrange said:
>>
> Basically Xen creates one or more virtual interfaces in Dom0 for each
> guest OS that runs. These are referred to as vif0, vif1, etc in the
> host OS, or just plain eth0 in the guest OS. In a pure bridging mode,
> the vifX devices will be connected straight to the host's real eth0
> device, so packets to/from the guest go to/arrive from the physical
> network without the dom0's network stack really getting involved. So
> if you have DHCP on your LAN, the guests will auto-assign themselves
> IP addr in the normal manner.
>

Well, I read that somewhere but didn't quite believe it - I assumed some
automagical step had been left out :) The wonders of Linux!

So do these virtual devices also have virtual NIC hardware addresses - so
I can assign what my router calls static DHCP?

I am starting to see the power of all this now.


> There is a possible alternative setup where you don't bridge the vifX
> devices onto eth0, and instead setup a traditional NAT forwarding using
> iptables. This gives you an isolated subnet for your guests, which may
> or may not be desirable depending on your intended use cases for the
> guests.
>
> Dan.
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