Re: [Xen-users] can any one help with NAT using xen 3.4.1

[Brian Krusic <brian@xxxxxxxxxx>]

Hi Tapas,

The domU is on a diff subnet then dom0.

And I need to keep that domU in its own subnet but not isolated.

I would rather only use 1 LAN card on the domU.

I'm unsure why I can't understand how to do this in Xen, I do it all  
day long with routers, VMware, etc...
Basically the domU should appear as 10.10.10.200 to the dom0 subnet  
while the domU itself remains at 10.0.10.200.

- Brian

On Apr 20, 2010, at 8:33 PM, Tapas Mishra wrote:

> > How will packets then know to go from 10.10.10.200 which is what  
> > the world
> > thinks my domU is  to 10.0.10.200 which is my internal domU IP as  
> > config'd
> > via its network scripts?
> I am a bit confused on your question is DomU on a different subnet
> than the LAN .
> 10.10.10.200 and 10.0.100.200 are both DomU how can you have 2 IPs on
> different subnet to your DomU are you using 2 LAN cards.If that is the
> case then you need to setup IPTABLES on Dom0.Even if you choose to
> isolate that then also IPTABLES you need to setup.
> Your Dom0 has to be configured to forward the packets coming to
> 10.10.10.200 to 10.0.100.200 then that means your Dom0 should also be
> in 10.10.10.x range .
> If it is a bridge setup you don't need to do all that simple
> forwarding will do  just check it once by enabling IP FORWARDING if it
> does not work then go ahead with IPTABLES.
>
> I am myself not clear on this  part but it seems that Xend daemon
> takes care of this part at least if both xen dom0 and xen domU are in
> same subnet otherwise if you check my messages on this list you need
> to have a dummy bridge and then configure routing from that.
>
> But I have seen if you ping from DomU to your network or want to do an
> SSH and on the other machine you see you will get IP of DomU only.
> You can use a 3rd machine on your network and login to it via DomU and
> then type command w to confirm that it is able to know your IP.
> It is as good as saying that your added a physical machine to your  
> network/
> For your DomU the Dom0 will be the gateway that you will have to  
> configure.
> and DNS will be same as for rest of machines on network,DomU needs to
> have just the gateway as Dom0 then xend daemon will take care of rest
> of the things.
>
> > Or should I also set the ip in config.sxp as you have written in  
> > section E?
> I have not said to configure IP on config.sxp
> you need to check vif-bridge and network-bridge words in the two lines
> there and uncomment if it is a bridged setup.
> and rest should be commented.
>
>
> --
> Tapas
>
> +91 8971248477

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