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

To: <enming.teo@xxxxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Bridged Networking in Dom 0 and Virtual NIC in Windows XP Home 32-bit HVM Guest
From: Caz Yokoyama <cazyokoyama@xxxxxxxxx>
Date: Sun, 23 Aug 2009 09:39:08 -0700
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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?

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

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