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

[Tapas Mishra <mightydreams@xxxxxxxxx>]

What I was suggested by some people on list is to make a dummy network
interface and use that in place of netdev='eth1'
i.e. netdev='dummy'
http://www.debian-administration.org/articles/470
then use routing etc.

On Wed, Apr 21, 2010 at 11:18 PM, Brian Krusic <brian@xxxxxxxxxx> wrote:
> 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
>
>



-- 
Tapas
http://wiki.xensource.com/xenwiki/Xen_on_4_app_servers
+91 8971248477

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