You have given too little information to really understand the networking environment you are working in. Also the referenced URL, the gentleman there doesn't clearly define how he has setup his Local area network. info regarding his DNS server, if the WRVS4400N doing DNS proxy... bla bla bla..I can only guess, but hopefully he contacted the Small business Support Center.
To save time, and maybe expedite a fix, it would be good to also open a incident with the Small business Support Center (SBSC). It would be good to reference the other URL you referenced, to the TAC technician so he/she can query David Carr.
I encourage you to place a call regarding this with the Small business support center. Anecdotally the other URL you reference, does point towards a failure in the operation of the WRVS4400N, but still don't know enough about his working networking environment.
Cisco: come off it already. This is a piece of crap router, and everyone knows it. This issue has been known for over two years, it affects just about every unit, regardless of firmware. The WRVS400N is a rip-off. We customers have been victimized by poor quality control and non-existent customer support by Cisco and it's small biz brand.
Poster: unfortunately, there is no solution for your problem other than to buy a non-Linksys piece of crap in the future. You need to check out linksysinfo.org and read all the reviews you can get your hands on, and NOT buy a newly-released Linksys product. This brand has been turned into a hit-or-miss sinkhole for money, and Cisco just doesn't give a damn.
Small business owner and fellow WRVS4400N victim for ~2 years now.
(I reboot regularly, refusing to spend more than an amortized $100/year on home office routers.)
In an attempt to be helpful, when you try to resolve off a different DNS server do you still get the same symptoms, or is it only when you resolve off your internal DNS?
If you need a public DNS server to try to resolve against, OpenDNS (http://www.opendns.com) is a good one to try, the IP addresses are at the bottom of their homepage. 22.214.171.124 is also publicly available.
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