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

I have a router on a LAN with 4 computers. One computer is a server with a static IP; the others are dynamic IP. All 4 DNS names resolve to an IP that is outside my LAN (i.e. a 208.* address instad of a 192.* address) and has a ping response time to match it (50-60ms instead of <1).

The only DNS-related option I see in the router configuration is "Enable DNS Relay". When I disable that, all LAN systems resolve correctly but Internet/WAN address cease to resolve at all.

What would cause a router to behave in such a manner?

share|improve this question

1 Answer 1

up vote 2 down vote accepted

Got it.

I had a domain name pointing at my IP address, and let the domain expire. However, I forgot that the router was configured with that domain name. I removed it and reset the device, but it still happened.

Then, on each of my client machines, I ran:

  • ipconfig /flushdns
  • ipconfig /release /renew

and it spontaneously started resolving correctly. Apparently the clients' FQDN (i.e. was persisting in the DNS cache?

share|improve this answer
This is a question, not an answer. It should be added to the original question as an edit or a comment. – Xavierjazz Dec 4 '10 at 2:15
@Xavierjax - no, it's the answer to his question. If you solve it yourself, posting your solution as an answer is correct. – Joel Coehoorn Dec 4 '10 at 2:52

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.