To save some typing, read this link:
http://www.dslreports.com/forum/r28724715-IPv6-IPv6-Asus-RT-N66U-SB6141-Solved-
My situation is pretty much identical. Comcast 25/5, SB6141, Asus RT-N66U running the latest Merlin firmware. I can't get IPv6 to work at all. In fact, when I initially installed the router, enabling IPv6 in Windows would instantly cause me to lose connectivity. Disabling it brought back service via IPv4 but it was acting strange/slow at times.
Reading that original thread, it seems the OP finally had success by simply unplugging and replugging his Ethernet cable. I've done that many times (along with rebooting PC, router, modem, messing with OpenDNS and Google DNS settings, etc). I now have IPv6 "enabled" via Google DNS and it does LOOK like it works (default gateway and DNS server listed via Windows Lan Status) but it shows "no internet connection" as well. And I fail online IPv6 tests.
I had a D-Link DIR-855 N900 router prior to this Asus and I do believe it worked with IPv6 though the same Comcast connection, through the same SB6141. So I'm at a loss. I guess I could just leave it as everything is stable and fast right now, but it's bugging me. Any ideas?
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