i can surf lowyat and youtube fine. the issue is setting up ipv6 mtu optimally. there are guides out there on google on finding the sweet spot for your mtu :}

what you want me to post    ?

i posted some instructions in an early post above. is that what you meant ?

simply put

1. i use tomato victek firmware
2. i change the ipv6 mtu using winscp < putty into the router itself to perform the change
3. i disable and re-enable the ethernet ports on my desktop

in layman talk, the higher the mtu the better. Usually i think this means something closest to 1492 roughly.

But sometimes the mtu is too high, thus causing stuff like youtube to hang not load. So you reduce the mtu to a lower value usually around the 14xx-1492 range to achieve the optimal mtu setting.

You need to trial and error using the guide in the source link to determine your optimal mtu to use.
Also from what i've been told, in tomato when i change the mtu, i also have to login to the router via winscp putty to change the mtu there which is for mtu ipv6. And that value is usually lower than the mtu that is set in the tomato gui settings mtu.

Maybe this method of doing things has changed in a newer tomato firmware, i don't know