I decided to setup 6to4 tunnel using Hurricane Electric service.
Although I have some wierd problem.
My pc in lan network have ipv6 address , I can ping any ipv6 address , DNS works too , but ...
other than pings I cant browse any ipv6 website , it just time outs , cant even browse anymore tunnelbroker website without turning off ipv6.
I was reading countless tutorials and I am sure I did everything correctly , even allowed the protocol 41 and set some ipv6 firewall basic rules but nothing seems to change that I cannot browse any ipv6 website.
http://test-ipv6.com/ website shows that everything is correct very fast, but on that last additional tab where it tests connection to ipv6 websites it cant connect with almost any website ( and even when it can , I cant go browse that website ).
Does anyone had similar problems with the 6to4 tunnel ?

I have currently Mikrotik RB951G-2HnD with ROS 6.30

eh I was messing so much in firewall that I didn't thought of obvious signs before me , lowered the tunnel MTU and everything works correctly now, I can browse fast any ipv6 website.