Bug #14522
openIPv6 doesn't get update on interface change if track interface is selected
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Description
How to reproduce:
configure a WAN connection with dynamic IPv6 and request a subnet:
Apply these settings.
Now configure LAN with IPv6 Tracking Interface enabled. 
Apply these settings as well.
Now IPv4 is working, but IPv6 does not getting assigned for the LAN-interface.
Now change the config of the WAN-interface IPv6 config again (e.g. alter the requested subnet size) and apply this. Now the LAN-Interface will get an IPv6 address and subnet.
Files
Updated by Krzysztof Konopko 2 days ago
Same here, 26.03.1-RELEASE (arm). Spent hours fiddling with the settings not being able to get IPv6 on interfaces, except only one which happend to be configured before I later updated something on WAN.
Only after finding this bug I made a bogus WAN interface change which immediately resulted in all other interfaces getting their IPv6. Quite likely a reboot would do the same.