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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 Settings\user1>nslookup internalserver
*** Can't find server name for address 192.168.1.1: Non-existent domain
*** Default servers are not available
Server:  UnKnown
Address:  192.168.1.1

Non-authoritative answer:
Name:    www.companyserver.com
Addresses:  xx.xx.xxx.xx, xxx.xxx.xx.xx
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One simple way would be to use a tracert and see where the connection goes through. Then after that you would just need to figure out what the connection it goes through is pointing to for a DNS server. –  jmreicha Jun 25 '12 at 20:42
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1 Answer

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 Address: 208.67.222.222

Non-authoritative answer: Name: www.google.com Address: 67.215.65.132

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Thanks! I tried that, but am not quite sure how to interpret the results. I pasted the results above in my questions as an edit. Any ideas? –  redstreet Jun 27 '12 at 5:46
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