Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

My company gave me a laptop for work and I've noticed that it is using my company's DNS servers even when I'm at home and not on a VPN. I noticed this because I typed a search term in Firefox, which usually does a Google I'm feeling lucky search when there is no DNS result. I also see weird requests going out in Wireshark. I could provide more info if necessary. The IP settings are set to obtain a DNS server automatically. Where could it be picking up this setting?

share|improve this question
What are the DNS server addresses? – John T Feb 22 '11 at 18:41

It is possible your laptop is caching previous dns results. Depending upon which OS you have you might try other things, but in Windows

at a command prompt type: ipconfig /displaydns (LAN local connection status DETAILS will show you this also) to see where the dns records are coming from.

Possibly try: ipconfig /flushdns to force a new dns lookup when you are at home using that dns provider

Figuring out what is being used for dns resolution will get you closer to fixing it. Thus John T is right to ask what dns address is being used first.

If your network device TCP/IPv4 properties is is set to obtain DNS server address automatically, you can always add your companies preferred dns server but also include others such as google & or opendns &

share|improve this answer
something weirder is going on, i wonder if they installed something on my laptop. im connected at work and the dns server is a local address, i dont understand how it knows to use a work dns server for dns when im at home – unknown Feb 22 '11 at 20:00
local meaning a non-routable address? 10.x.x.x or 192.168.x.x? Your laptop will also cache previous dns resolutions, that is why ipconfig /dnsflush forces it to resolve them again afresh. Are there explicitly assigned dns servers or is the nic set to obtain dns servers? – datatoo Feb 22 '11 at 20:17

The network configuration allows a fixed DNS to be set. Check Control Panel -> Network and Internet -> Network Connections. Right click on your network interface and click properties. This will require an administrator password. The configuration will be in the properties for Internet Protocol Version 4.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.