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Re: [Xen-users] Confused about how to setup Private networking between A

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Subject: Re: [Xen-users] Confused about how to setup Private networking between Apps on different Domus
From: Simon Hobson <linux@xxxxxxxxxxxxxxxx>
Date: Mon, 16 Feb 2009 08:02:25 +0000
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Robert Danruffin wrote:
I just started working on Xen for my office setup a couple of weeks
ago, and got to the point where I can install just about everything I
need as a simple Guest.

Now I'm trying to setup private communications between Domus, using
bridges with internal IP addresses.

For example

  | 192.x.x.1
Dom0 -------- Bridge A ---- Domu #1
  |                        |
  |                        | Private Bridge, 10.0.0.X
  | 192.x.x.2              |
  |---------- Bridge B ---- Domu #2
  |                        |
  |                        | Private Bridge, 10.0.0.X
  | 192.x.x.3              |
  |---------- Bridge C ---- Domu #3

(Sorry, I'm not too sure about drawing these things the right way)

Domus #1 & #3 are Apache web servers and Domu #2 is a Mysql database server.

If I do everything over the 192. addresses, everything talks to everything.

With this new setup I've got each of the Domus configured with 2 IP
addresses but I can't figure out how to get the web servers to talk to
the database server over Private Bridges.  In other words using the
10. addresses, not the 192. addresses.

I'm stuck about understanding how this is supposed to work, and what
I'm supposed to set where.

Look up in the various howto's, and the archives for the list how to set up two bridges with two ethernet cards in Dom0. Then you'll find somewhere in the docs how to do it with a 'dummy' ethernet card in Dom0 - though personally I never got this to work. I've never got a bridge to work where the Dom0 didn't have an interface in it.

Once you've got that working, the routing should be automatic - each DomU will see that it has a local interface on and will route via that rather than via the default route on 192.x.x.0.

Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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