I too have been having buffering issues with Youtube for some time now. I'm on Brighthouse Networks in Orlando. In the past this was due to using the ISP's DNS servers and I switched to other servers based on GRC's DNS Benchmark app. That helped clear it up for me on other routers I've used in the past (including my beloved RT-N16).
However, since moving into our new house and Brighthouse Service becoming available here, I upgraded my router to the N66U and have never been able to get Youtube to consistently buffer without issues.
One thing that's confused me on this router is the DNS options in the LAN vs the WAN...which one would I set if I wanted to set my own DNS server addresses. Will one conflict with the other if both set? In Tomato on the N16 there was only one place to put in three DNS ip addresses. I really could use some help on what the LAN vs WAN DNS settings mean. I've not found something concise in my searches so far.
Even though I've tried many different configurations between setting my own DNS to leaving all options blank, nothing seems to have helped keep buffering from happening. Occasionally, videos seem to load fine, but most times not. I have the 40 down 5 up service and speedtests are always usually 45/6 at many different sites. Pingtest.net results are great too.
I never have any problems with Netflix or any other services...just Youtube it seems. Thanks for the help.
Edit for clarification:
The reason I get confused with these settings is because when I leave LAN blank and only set WAN DNS then my devices report my DNS as being 192.168.1.1 but I assumed WAN DNS should be the one I set. On Tomato on the RT-N16 I always saw the 3 different DNS servers that I set myself.
Last edited by EskimoDragon; 02-16-2013 at 12:21 PM.