[Xen-users] Do I need a dummy?

[Jock Coats <jock.coats@xxxxxxxxxxxxxxxxx>]

Hi all,

I managed to get all my VMs (5 in total) up and running in bridged  
mode with public IP addresses from my ISP.  All are running Debian  
Etch in a Dom) of Debian Etch with Xen 3.1 using the instructions  
here: http://www.howtoforge.com/debian_etch_xen_3.1
But ideally I only want two of the DomUs on the public internet with  
the other three only on an internal network and the two public ones  
also connected to these so they can use databases and filestores on  
the private side machines.  Does that make sense?  I'll try and attach  
a PNG but if it doesn't come out in the email you can see it here:
http://www.jockcoats.org.uk/jocks_xen_network_ambitions

Assuming that diagram is roughly correct I assume I need two bridges,  
one connected to Dom0's physical ethernet card with my two public  
machines attached, and one without a network connection to the outside  
world to which all the VMs are connected with private IP addresses and  
so on.  And that by adding routes I can get the zimbra server to mount  
nfs drives say from one of the private machines or other services I  
don't want exposed directly to the outside world.
Searching around I find a couple of blog postings or Wiki articles  
saying that you don't need the "dummy0" interface any more.  I'm not  
sure I can see how to setup a bridge without either specifying one or  
it defaulting to eth0.  So, do I need a dummy?  And if not how do I  
set up the bridge without?
Cheers,

Jock
--
Jock Coats, JC Solutions - Connecting Communities
Warden's Flat 1e, J Block Morrell Hall, OXFORD, OX3 0FF
m: 07769 695767 skype:jock.coats?call http://jcsolutions.co.uk

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