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Re: [Xen-devel] Bridged Networking in Dom 0 and Virtual NIC in Windows X

To: cazyokoyama@xxxxxxxxx
Subject: Re: [Xen-devel] Bridged Networking in Dom 0 and Virtual NIC in Windows XP Home 32-bit HVM Guest
From: "Mr. Teo En Ming (Zhang Enming)" <enming.teo@xxxxxxxxxxxxxxx>
Date: Mon, 24 Aug 2009 00:47:50 +0800
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Dear Caz,

I have the Intel Corporation 82567LM-3 Gigabit Network Connection on my Intel DQ45CB Desktop Board.

There is only one network interface on my computer and it is eth0.

When I start xend, it creates ethernet bridge eth0. My Dom 0 and Win XP Dom U share the same ethernet bridge.

On Dom 0, IP address is configured on the bridge eth0. In my Win XP dom U configuration, I specified vif = [ 'bridge=eth0' ]

So my Dom 0 and Dom U are sharing the same bridge, and hence the same physical network card.

Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics Engineering) 
BEng(Hons)(Mechanical Engineering)
Technical Support Engineer
Information Technology Department
Asiasoft Online Pte Ltd
Tampines Central 1 #04-01 Tampines Plaza
Singapore 529541
Republic of Singapore
Mobile: +65-9648-9798
MSN: teoenming@xxxxxxxxxxx
Alma Maters: Singapore Polytechnic, National University of Singapore

On 08/24/2009 12:39 AM, Caz Yokoyama wrote:
Hello Teo,
What type of network device do you have? Virtual network or shared physical
device? If you have virtual network, I suspect your domU and dom0 are in
their own sub-network and the domU is not visible to anyone other than dom0.
If you have shared physical device, root cause is something else.

-----Original Message-----
From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Mr. Teo En Ming
(Zhang Enming)
Sent: Sunday, August 23, 2009 9:09 AM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Bridged Networking in Dom 0 and Virtual NIC in Windows
XP Home 32-bit HVM Guest


My Intel DQ45CB motherboard BIOS has VT-d enabled. I am using Xen 3.4.1
and Jeremy Fitzhardinge's paravirt ops dom 0 kernels 2.6.30-rc3 and

When Xen boots up, it says that I/O virtualisation is enabled (VT-d

I have Windows XP Home 32-bit installed as a HVM guest. I am not trying
direct access to physical NIC yet.

I am still using virtual NIC in Win XP Home.

When I configured IP address in Win XP HVM guest, I can ping the IP in
Dom 0. In Dom 0, I can also ping the IP of my Win XP domU.

However, other network devices/computers in the same LAN cannot see the
IP of Win XP domU. Only Dom 0 can see. Similary, Win XP dom U can only
talk to Dom 0 and cannot talk to other computers in the network.

Why is this so?

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