The ipv6 of wan has an additional address that is the same as the lan local link

[fengchen_opn]

After webui interfaces-overviews wan 'Reload', wan's ipv6 has an additional address that is the same as the lan Link-local address.
The same situation is also seen when using the ifconfig command to check the PPPoE interface. Restarting the system can back to normal.

Type   opnsense   
Version   24.7.1   
Architecture   amd64   
Commit   2d070ccc8

[Patrick M. Hausen]

Link local addresses are link local  ;) They are only defined and unique within the scope of a single link. So having the same one on multiple interfaces is not a problem.

Also every interface with an IPv6 GUA (global unicast address) always has an additional link local address. This is also intentional.

[fengchen_opn]

The wan port originally had a link-local address that was different from the lan port. The problem was that it added a link-local address that was the same as the lan port.

[doktornotor]

It is perfectly valid and normal to have exact same link-local IP on as many interfaces as you want.

[Patrick M. Hausen]

The problem was that it added a link-local address that was the same as the lan port.

This is not a problem.

[dseven]

I agree that the LLA being the same isn't an issue, but if it looks different after a reload vs after a reboot, somethhing's inconsistent, at least?