Xen users - Jun 2008 - Xen + NAT + dhcp (static assignment using MAC)

Hi,

I am using Xen packages that came with CentOS 5.
I am a noob at Xen, so please bear with me.
I tried the tutorials I found on the internet, but none of them seem to work
for me.

GOAL: I want the domU machines to have local NATed network connection to the
internet via some fixed IP address.

I had no luck trying to get static IPs to work.  (I can ping any machine on
the internet, but DNS resolution never worked for me)

domU''s getting an IP via dhcp works fine.  (internet connection works
as
supposed to)
But I am having trouble telling dnsmasq to assign a specific IP to a machine
with a specific MAC address.
Here is what I''ve tried.

/etc/dnsmasq.conf
...snip...
dhcp-host=00:16:3e:4d:bc:30,192.168.122.11
...snip...

But this is being totally ignored.  Am I even modifying the relevant file?
Does dnsmasq handle all dhcp and dns requests from all domU''s?

This is minor, but how do I change the network pool?
dhcp request wants to hand out 192.168.122.0 addresses, but I want to change
this.

Any help will be appreciated!

Thanks!

-- 
Sang Oh


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On Fri, Jun 27, 2008 at 5:35 PM, Sang Oh <sangoh@gmail.com> wrote:
> Hi,
>
> I am using Xen packages that came with CentOS 5.
> I am a noob at Xen, so please bear with me.
> I tried the tutorials I found on the internet, but none of them seem to
> work for me.
>
> GOAL: I want the domU machines to have local NATed network connection to
> the internet via some fixed IP address.
>
> I had no luck trying to get static IPs to work.  (I can ping any machine on
> the internet, but DNS resolution never worked for me)
>
> domU''s getting an IP via dhcp works fine.  (internet connection
works as
> supposed to)
> But I am having trouble telling dnsmasq to assign a specific IP to a
> machine with a specific MAC address.
> Here is what I''ve tried.
>
> /etc/dnsmasq.conf
> ...snip...
> dhcp-host=00:16:3e:4d:bc:30,192.168.122.11
> ...snip...
>
> But this is being totally ignored.  Am I even modifying the relevant file?
> Does dnsmasq handle all dhcp and dns requests from all domU''s?
>
> This is minor, but how do I change the network pool?
> dhcp request wants to hand out 192.168.122.0 addresses, but I want to
> change this.
>
> Any help will be appreciated!
>
> Thanks!
>
> --
> Sang Oh
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

The easiest way to do nat is with shorewall.  You need at least two
interfaces. One for the external connection and the other interface bridged
to your domU''s

 Chris


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