Re: [Xen-users] is it a good idea to share an IP with dom0 & domU?

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

You can't "share" an IP with your server.  If your dom0 has an IP assigned by the ISP for you to access it to manage, you cannot assign that IP to any other domU on the system.  IPs must always be unique.  With bridging, each domU must have an IP that the network connected to the bridge can see.  So, if your dom0 eth0 has an IP address and you set up a bridge for the domUs to access and want them to communicate with the dom0 and on the same network as the dom0, they need to be on the same subnet and have the same subnet mask.  The other option is to do some sort of NAT setup using the dom0 IP address and iptables (e.g. on a Linux-based dom0) so that your domUs use NAT to see the outside world.  In this setup you can use port forwarding on the dom0 to forward certain services into the domUs, but each port can only forward to a single domU.

 

-Nick

>>> On 2008/06/20 at 16:41, Rudi Ahlers <Rudi@xxxxxxxxxxx> wrote:

Hi all

I wonder if someone can give me some suggestions, from experience on this.

We have 4 IP's per server, and I'd like to use them wisely. dom0 won't
really be used, other than accessing / managing / monitoring domU's.

So, is it wise to share the main IP of the server with a domU ?

And from what I understand, this is bridging, right? I need to access
the domU directly from the internet, via the IP that our ISP has
assigned to us.

--

Kind Regards
Rudi Ahlers
CEO, SoftDux

Web:   http://www.SoftDux.com
Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff

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