Did a little snooping today, found this post:
http://www.tunnelbroker.net/forums/index.php?topic=2101.0It appears that the bidirectioniality of the IPV6 firewall is broken. The firewall indeed works and works well. But because it is not letting requests out, it is breaking IPV6. It appears the poster in the above thread ran into the same thing and got a fix in a later firmware. I am usually patient.
Switching from the DIR-825 to the DIR-827, I find even considering the DIR-827 is not a legacy product, the router is stable much like the DIR-825 was but with more features. Once they kick the bugs out of the firmware, things will be much better. Testing various features in the router, stuff that took years to get fixed in the DIR-825 are stable in the DIR-827 with the latest firmware update, 1.02.
I see people complaining about the QOS upload limit, why? Turn it off, never did like being QOSed......
One thing I read about the DIR-827 is the lack of WiFi range, I have only tested the 5Ghz side, MUCH improved over the DIR-825. I held off on one of these because I hate internal antennas. I am seeing a 15+ db signal increase on the 5Ghz band over the DIR-825, that is huge. I will test more this weekend, I would personally like to switch to 5Ghz for around the house and this bad boy might allow me to do it.
If you have enough band width, QOS is more like a "speed bump", this router spreads the band width around just fine!
Here is to hoping the IPV6 fix is quick and painless. Considering the day, everybody and their brother is resolving IPV6 addresses when they only had IPV4 addresses last week.
http://www.worldipv6day.org/ World IPV6 day 6 June 2012.