[FS#668] ipv6 not working after some time

[LEDE Bugs]

The following task has a new comment added:

FS#668 - ipv6 not working after some time
User who did this - lucize (lucize)

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so I removed the wan6 interface reboot and netifd: Interface 'wan_6' is now up, but again after a short time ipv6 test tells me that I don't have ipv6 connectivity

windows 7,chrome, ipv4 static, but I made a test on windows 10 and I get ICMP reachable and seems to be still working, my android phone too, so maybe it's the windows 7 setup not ok

thank you for your time !
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=668#comment2295