Xen users - Mar 2012 - Directly connecting two domU

Hi,

I have following problem which I wasn''t able to solve:
I have two domU, let''s call them domU1 and domU2, and I need to set up
two networks:
- one bridge for domU1 which will connect it to real Ethernet (done)
- some private network only between domU1 and domU2. 
Is it possible?

In VMware it''s very easy to do so by creating multiple virtual Ethernet
cards and setting up the network in the standard matter, but since Xen has
different idea behind networking, I''m a bit lost.

Thanks a lot!
Libor

Hi,

I have following problem which I wasn''t able to solve:
I have two domU, let''s call them domU1 and domU2, and I need to set up
two networks:
- one bridge for domU1 which will connect it to real Ethernet (done)
- some private network only between domU1 and domU2.
Is it possible?

In VMware it''s very easy to do so by creating multiple virtual Ethernet
cards and setting up the network in the standard matter, but since Xen has
different idea behind networking, I''m a bit lost.

Thanks a lot!
Libor

Libor wrote:
>I have following problem which I wasn''t able to solve:
>I have two domU, let''s call them domU1 and domU2, and I need to set
>up two networks:
>- one bridge for domU1 which will connect it to real Ethernet (done)
>- some private network only between domU1 and domU2.
>Is it possible?
>
>In VMware it''s very easy to do so by creating multiple virtual 
>Ethernet cards and setting up the network in the standard matter
Yup, that''s just how you do it with Xen.
Just create another bridge in the host (using the hosts native 
tools), and add a second virtual NIC to each guest.
So you''d use :
     vif  = [ ''bridge=br0'', ''bridge=br1'' ]
in your guest config - substituting whatever names you used for your bridges.


-- 
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Libor <li.v@email.cz> schrieb:
>I have following problem which I wasn't able to solve:
>I have two domU, let's call them domU1 and domU2, and I need to set up
>two networks:
>- one bridge for domU1 which will connect it to real Ethernet (done)
>- some private network only between domU1 and domU2.
>Is it possible?
yes.

as long as you did not run out of any regarding device handles you may
create/use as many bridges or vifs as you like ß)
>In VMware it's very easy to do so by creating multiple virtual Ethernet
>cards and setting up the network in the standard matter, but since Xen
>has different idea behind networking, I'm a bit lost.
hmmm,
the priciples behind XEN for such a setup are the same as in VMware or
VirtualBox:

assuming you want to do a fully bridged setup:

- - create two linux bridges like public0 and private0 (i.e. brctl add or by
your OSs default networking mechs)

- - create two vifs on each domU (DomU config plus network-bridge in xend.conf)

- - connect one of the vifs to public0 and the other to private0 (in DomUs
configs)

- - connect public0 with a "public" (real hardware) interface - so
that virtual "switch" is connected with the "outside"
network

you may then give IPs from your public network to the vifs on public0 within
your DomUs and i.e. from a private address segment on vifs on your private0
bridge.

Now you can reach DomUs vice versa by private IPs without any
"physical" connection to a outer network over bridge private0 and
public with public IPs on the public0 switch.

If you want to connect Dom0 from DomUs you should give at least one of the
bridges (i.e. private0) an IP too (ip or ifconfig).


hth
best regards,


Niels.
- --
Niels Dettenbach
Syndicat IT&Internet
http://www.syndicat.com
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