Tomato RAF with included BitTorrent Client - beta testing

I suspect that without further info from you, unless someone else comes forward with a DHCP-PD type set-up, it very much won't be fixed in 110-AIO! By trying to ping from the router you've already helped greatly in that debugging process - I now know that the router has a globally routable IPv6 address which it has obtained via DHCP-PD. The problem is handing out the obtained prefix to your local LAN.

There has been a big step change from using a relatively un-intelligent programme (radvd) to something a bit more clever (dnsmasq), however dnsmasq is also a bit more fussy. The first thing I'm going to ask you is 'what is the prefix length?' If it is lower than 64 (eg 48/56) please try changing it to 64, reboot your router, try the ping test from your router and only if that succeeds, reboot your PC and try the ping from your PC.

If the router ping test fails then I'll have to have a bit more of a think.

Thank you everyone for your interest in solving this issue.
@Kevin Darbyshire-Bryant,
the prefix length is 64 and I tried also 48 and 56, rebooted...I even disabled the antivirus, nothing happened, same thing...
Pinging from router system is working in all this three cases, but like I said in my previous post, when I try to access a IPv6 site, the only thing I get is a deep silence...
However, if you or anyone think that I can help with more information I'll gladly do it even if I don't know much about Linux, firmware, etc...