Re: [Xen-users] Do I need a dummy?

[Jock Coats <jock.coats@xxxxxxxxxxxxxxxxx>]

Just to say I managed to get this scenario working very satisfactorily  
using the instructions here:
http://docwhat.gerf.org/2008/08/xen-networking/

I don't know what made that howto work for me when others didn't and  
like the author I had tried to fathom it all out from books and other  
websites, but for some reason his explanation just clicked.  And yes,  
I have used a dummy0 adaptor even if I didn't have to.
I had a brief problem (I hope) after getting it all working in that I  
couldn't seem to connect to my web VM - one of the public ones - from  
my desktop in the UK but could using lynx on my other physical server  
in the same datacentre.  But I don't think that can be anything to do  
with Xen networking.
Cheers,

Jock

On 10 Sep 2008, at 18:27, Jock Coats wrote:

> 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
>
> <XenNetworkDiagram.png>
>
>
> 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?
--
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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