setup ipv6 with BT Infinity(VDSL) through Mikrotik RB750 GR3

[aug]

Hello

I met a very strange problem about ipv6,I got a Mikrotik RB750 GR3 (ROS 7.2 RC1)router and Huawei HG612 modem, ipv4 part is no problrm. But when I try to setup v6 part,some oddly situation arrived.

I add a dhcp-client with 56 prefix

and status seems ok

and I add address

everything seems ok, and computer and cell phone shows IP v6 address assigned. the fromat is start with 2a00:23c7:f684

BUT

when i go to test-ipv6.com  and ipv6-test.com,include computer and cell phone, got this kind of result

and also, at win10 ethernet status shows ipv6 "no internet asscess"

When i restart router or modem, the assigned V6 IP of terminal changed synchronous，"pretend" they are really working, but they are not working at all. 

As firewall part, I just turn off the firewall, to avoid any interference。

And i reset router, repeat again, no change.

Changed to BT homehub6A, every problem disappear.

So, could any one give me some suggestion to solve this uncommon miracle？

Thank you very much.

[aug · Accepted solution]

Finally, it solved, after ROS 7.2RC5 updated.

And do not select Add default route in DHCP v6 client

[aug]

After ROS updated.

The related fix log of ROS 7.2RC5 about this ipv6 issue:

ipv6 - do not add duplicate dynamic prefix when static already exists;