ASP Developer Network - Brought to you by Steve Radich and BitShop, Inc. - http://www.bitshop.com

ASPDeveloper

ASPDeveloper.Net / VirtualServerFAQ.COM

Make sure you go to our home page for:

* Virtual Server 2005 FAQ
* ASP.Net 2.0 Information
* ASP.Net 2.0 Streaming Tutorials
* ASP.Net 2.0 HTML based Tutorials

Made possible by Business Internet Technology Shop (BitShop)

Virtual PC

Recent Virtual PC posts

* Very slow in Virtual PC
* Windows XP X64 as Main Drive and XP 32 bit as secondary physical drive
* Problem with dos 6.22 and game wizard
* Disk Images
* Help with VPC
* Add new Virt.PC but without wizard...
* ** Licensing software driver crash Virtual PC **
* OS/2 Short Lockups
* Need help installing MS-DOS
* Sound pops and crackles while running Win95 as the guest OS
* Same IP address on Virtual as on host
* Virtual PC 2007 Beta
* Futures Question...
* mouse pointer problem in VMs
* Virtual PC & Windows Media Center
* network connectivity between host PC and Virtual PC
* common drive for DOS and Windows question
* Install full OS for each instance of Virtual PC?
* Virtual PC could not open the Virtual Machine Network Services driver
* Can you share a folder in DOS?

Add Solution

Networking between Virtual PCs

Source: microsoft.public.virtualpc
Sent: 10/01/2006
From: (email address - cut out)
Message:

Hi,

I am using Virtual PC 2004. I've got two guest PCs both of which are
running Windows XP with SP2. I've configured both the guests to use
the "Microsoft Loopback Adapter" and I've installed and configured the
loopback adapter on the host (which is also running XP with SP2). The
PCs have all been configured to use TCP/IP with static IP addresses
assigned from the 172.16.0.* address range. No gateways have been
configured.

I basically want my host and the 2 virtual machines to be able to talk
to each other. Both of my virtual machines are able to ping the host
successfully. The host is also able to connect to the virtual PCs.
Communication *between* the virtual machines however is not working.
If I ping VPC2 from VPC1 it always times out (and vice versa).
However, I am able to see an entry in the ARP cache for the remote VPC,
i.e., if I do this from VPC1 assuming 172.16.0.3 is the IP address of
VPC2:

C:\> ping 172.16.0.3

Pinging 172.16.0.3 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 172.16.0.3:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

C:\> arp -a
Interface: 172.16.0.2 --- 0x10003
Internet Address Physical Address Type
172.16.0.3 00-03-ff-4d-4f-50 dynamic

As you can see the network is working up until ARP. It's the physical
communicatino that's not happening. I think I am missing something
basic. Appreciate if you folks can help!

Thanks.

--
Ranju. V
http://blogorama.nerdworks.in/
--

Post Reply | This is Spam! | Mark as Spam

Related Messages

Re: Networking between Virtual PCs

Sent: 10/01/2006
From: (email address - cut out)
Message:

(email address - cut out) wrote:

Err. I managed to figure out what the problem was myself :-P. It
turned out to be pretty silly actually. I'd had the default XP
firewall turned on on both the virtual machines and the firewall was
just dropping all ICMP packets. I turned the firewall off on both the
machines and everything started working well!

Thanks.

--
Ranju. V
http://blogorama.nerdworks.in
--

Show quoted text

> As you can see the network is working up until ARP. It's the physical
> communicatino that's not happening. I think I am missing something
> basic.

Re: Networking between Virtual PCs

Sent: 10/03/2006
From: Tony Gravagno <(email address - cut out)lid>
Message:

(email address - cut out) wrote:

I'm surprised it's working. I've found there is no need to use a
Loopback adapter at all, and it can even cause problems. I used to
use loopback all the time until Bill Grant or someone else here
suggested I simply don't do that.

The Loopback Adapter is assigned a physical MAC address which cannot
be changed, even though it's a virtual device. That address is
hard-coded as 02-00-4c-4f-4f-50, which translates to:
02= smiley face (probably unintentional)
00= null
4c4f4f50= LOOP

Execute IPCONFIG /ALL to see this on each host that is running the
loopback adapter.

If two devices with the same MAC address are put on the the same LAN
you're going to get conflicts, even though you've assigned different
IP addresses to them. Problems will appear to be physical connection
issues, usually with one VPC guest connection dying as soon as another
VPC guest somewhere on the network is booted. So unless you address
this by simply eliminating the loopback adapter, your recent success
may be short-lived.

HTH

Show quoted text

>(email address - cut out) wrote:
>> As you can see the network is working up until ARP. It's the physical
>> communicatino that's not happening. I think I am missing something
>> basic.
>
>Err. I managed to figure out what the problem was myself :-P. It
>turned out to be pretty silly actually. I'd had the default XP
>firewall turned on on both the virtual machines and the firewall was
>just dropping all ICMP packets. I turned the firewall off on both the
>machines and everything started working well!
>Thanks.

Post Reply | This is Spam! | Mark as Spam

Other groups

Virtual PC (Mac)(3592)	Virtual PC(12844)	Virtual PC (French)(496)
Virtual Server 2005(6245)

Our Sponsors

Virtual Server 2005 Info Here!
http://www.aspdeveloper.net

Wiki

Blogs

Articles

Image galleries

File galleries

Forums

Maps

Directories

ASP Developer Network (since 1996) - Brought to you by Steve Radich and BitShop, Inc. - http://www.bitshop.com
Copyright © 1997-2005 by BitShop, Inc. All Rights Reserved.
No content may be reproduced in any form without written permission from BitShop, Inc.
We will be honored to assist with reproduction rights on our material if you contact us.
We also can provide print articles for your magazine, private training seminars at your site, and conference presentations.
Thank you for visiting. Please bookmark our site if you found it useful!
If you wish to make a donation it will help further the development of these free resources: