ipv6 Firewall - How to find fixed Interface ID

[marchelo]

Hello,

In ipv6 all IP addresses are not fixed. They depend on network prefix provided by ISP (in my case it is not fixed).
So I can't use IPv6 addresses in firewall config.

Merlin allows to use "fixed Interface ID". But I do not know where to find it. I tried several options but none is working.

Could somebody help how to find fixed Interface ID for:
- Windows Machine
- Android phone
- iPad

and in what format to enter it in Merlin's interface.

Thank you.