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VPC, VPN and public internet access

Source: microsoft.public.virtualpc
Sent: 08/23/2009
From: Arend <(email address - cut out)>
Message:

Hi,

I am running a Windows XP SP3 guest in which I have a Cisco VPN client
installed. The virtual machine is configured for NAT networking.

On my home network (linksys wireless router wrt54) I can bring up the
virtual machine, connect from the virtual machine to my company
through the VPN and access the company network through the virtual
network interface provided by the VPN. I can also connect from the
virtual machine to external web servers (e.g. www.google.com) through
the 'NAT' network interface in the virtual machine. So far so good.

When I connect the host system to the web through a public internet
connection e.g. a hotel, airport or starbucks, I cannot access non-
company servers (e.g. google) after establishing the VPN connection.
http requests from the guest system to servers outside the VPN are not
answered. The problem is not a name resolution issue as www.google.com
can be 'ping'ed' even when connected to the VPN.

It looks like the public access points 'see' two network cards trying
to use the service and restrict http return packets to come through.
Any ideas to solve this problem would be appreciated.

Here are cut-and-pasted commands from the guest system with the host
connected through a public access point.

Before VPN access
===============

$ ipconfig

Windows IP Configuration

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.131.66
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.131.254

PocketXPuser@pocketxp ~
$ wget www.google.com
--2009-08-23 11:56:59-- http://www.google.com/
Resolving www.google.com... 74.125.159.147, 74.125.159.104,
74.125.159.103, ...
Connecting to www.google.com|74.125.159.147|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: `index.html.4'

[ <=> ] 5,049 --.-K/s in
0.009s

2009-08-23 11:56:59 (549 KB/s) - `index.html.4' saved [5049]

PocketXPuser@pocketxp ~

After VPN access
===============

$ ipconfig

Windows IP Configuration

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.131.66
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.131.254

Ethernet adapter Local Area Connection 5:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.34.3
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :

PocketXPuser@pocketxp ~
$ ping www.google.com

Pinging www.l.google.com [74.125.19.103] with 32 bytes of data:

Reply from 74.125.19.103: bytes=32 time=8ms TTL=128
Reply from 74.125.19.103: bytes=32 time=9ms TTL=128
Reply from 74.125.19.103: bytes=32 time=9ms TTL=128
Reply from 74.125.19.103: bytes=32 time=8ms TTL=128

Ping statistics for 74.125.19.103:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 8ms, Maximum = 9ms, Average = 8ms

PocketXPuser@pocketxp ~
$ wget www.google.com
--2009-08-23 11:57:56-- http://www.google.com/
Resolving www.google.com... 74.125.19.103, 74.125.19.147,
74.125.19.106, ...
Connecting to www.google.com|74.125.19.103|:80...

and I get stuck here

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