DNS when using split VPN on Windows

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I’m using split-VPN on Windows XP as shown in:

VPN: Does all traffic get routed through the VPN when I am logged in?

My question is: how do I find out where DNS requests go? If I type an address (like www.google.com) into my browser, which of the two network interfaces resolves it? My hosts file has only one entry for localhost.

EDIT: Even if the VPN client is not running, I seem to be able to do an nslookup on “internalserver” which is not an internet hostname, but a private one that exists only inside the VPN network. Where might this be coming from? Does Windows cache DNS lookups somewhere? Where?

C:Documents and Settingsuser1>nslookup internalserver
*** Can't find server name for address Non-existent domain
*** Default servers are not available
Server:  UnKnown

Non-authoritative answer:
Name:    www.companyserver.com
Addresses:  xx.xx.xxx.xx, xxx.xxx.xx.xx


You can see what DNS server replies by opening a command prompt and typing nslookup www.google.com This should show the IP of the DNS that resolves www.google.com

My system reports as follows and indicates I am using the OpenDNS server
Server: resolver1.opendns.com

Non-authoritative answer:
Name: www.google.com

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