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Hi,

I ran with such a config for about 3 years on my home network without problem :
- Linux with shorewall in a domU
- PCI pass through for the ethernet card connected to internet.
- Two bridges : br-dmz and br-loc configured at the OS level on dom0. (disabled the network-bridge script).
- As all my dmz host were domU, there was no physical interface linked to the br-dmz bridge.
- All guests paravirtualized. (no virtualization support in my CPU at that time).

Nothing to say, this just worked. AFAIR, I had some problems with the pci passthrough that I solved by using a different brand for the ethernet card connected to internet. This is probably fixed now.

Some 5 months ago, I had to migrate to KVM/libvirt because of lack of support for ivtv and nvidia in a xen dom0. I had to use a bridge for the connection to internet interface, this works too.

FranÃois.

----- Original Message -----
From: "Christian Fischer" <Christian.Fischer@xxxxxxxxxxxxxxxxxxx>
To: xen-users@xxxxxxxxxxxxxxxxxxx
Sent: Friday, 31 July, 2009 21:46:04 GMT +01:00 Amsterdam / Berlin / Bern / Rome / Stockholm / Vienna
Subject: Re: [Xen-users] Network Interface Problems for DomU Firewall

On Friday 31 July 2009, Tom Jensen wrote:
>
[snip]
>
> As I mentioned before, my ultimate goal is to configure a standard three
> interface firewall within the DomU. Most of the information I have found
> on the subject suggests the most secure way to accomplish this is to
> dedicate the interface connected to the Internet to the DomU using PCI
> passthrough. The other two interfaces (DMZ & LAN) would be virtual
> interfaces bridged to the Dom0. I am open to other concepts for creating
> a firewall DomU if anyone cares to share their configurations.

How about to have the firewall inside dom0? If it hasn't more to do than
routing/firewalling i think a separate domU is a bit blown.

You could replace /etc/xen/scripts/network-bridge with a dummy script (always
exit 0, no interface renaming), create simple bridges eg. brnet (bridge
interfaces eth0), brlan/brdmz (no bridge interfaces, no ip) and add the domU
vifs to these bridges.

You could now firewall inside the bridges.

Have a look at http://www.shorewall.net/manpages/shorewall-hosts.html if you
use it. Works fine.

Christian

>
> > --
> > Fajar
>
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