I am see some random complains with Level 3 DNS. I don't know if this is a temporary problem or chronic to being overloaded. As a Level 3 customer we have an open support ticket but have not gotten a satisfactory answer from Level 3 engineers. I am recommending changing your routers, PCs to use Neustar's DNS at:


Recursive DNS Essential at No Cost


156.154.70.1

156.154.71.1


http://www.neustar.biz/services/dns-services/free-recursive-dns

 

An alternative would be use Dyn DNS which has become very popular over the past year

 

216.146.35.35 

216.146.36.36

 

http://setup.dynguide.com/

 

I would NEVER recommend using AT&T or TW Cable's DNS as they are very slow, time-out and have very long TTL times. You will find other Free public DNS servers and reviews at http://pcsupport.about.com/od/tipstricks/a/free-public-dns-servers.htm