router: RB750
RouterOS version: 6.0rc7

6to4 tunnel setup:
http://wiki.mikrotik.com/wiki/Setting_u ... l_via_6to4
with only difference in the route (one from manual does not work):
ipv6 route add dst-address=::/0 gateway=ipng-tunnel

ping ipv6.google.com - works
ping ipv6.yandex.ru - does not work, as well as for many other sites

What I guess is that 6to4 tunnel does not accept incoming packets that has source address different from one set up in the tunnel ( 192.88.99.1 in my case)

I found this by enabling logging with firewall on WAN interface with Proto-41 filter - reply packets from ipv6.yandex.ru showed up.

Please fix this in the next release

any update?

6RC9 installed - the issue is still there
can I have at least a confirmation or any comment on this?
can anyone confirm that I'm in the right forum for this issue?
how can I get any support from mikrotik? is it official forum or what?

This is just a user forum. You can email official Mikrotik support at support@mikrotik.com

Hello! The problem is resolved? I repeated in 6.1 version.

I had the same problem with 6to4.nro.net

I found workaround: create second 6to4 interface with empty remote-address (tested on RouterOS 6.6).

For example: