x) Tuesday Jan 23, 2018, 16:14. Michiel van der Vlist ÄÄ Alex Shuman.

 AS>> So it is set automatically by ISP and changes every time you
 AS>> reconnect? Then how did you set it to f1d0-style?
 MvdV> No, they call it dynamic, because they do not guarantee that the /56
 MvdV> prefix will never change. Since November 2017 it has only changed once.
 MvdV> That was after a three hour unscheduled power down. Short power
 MvdV> interuptions do not seem to cause a change.
 MvdV> Even so, all THEY set is the prefix. Within the /64, I can either
 MvdV> use SLAAC or configure it manually. The latter I did for the
 MvdV> ::f1d0:2:280:5555 part.

So they don't enforce specific IP, cool. I got my f1d0 IP the same way (ISP has 
radvd for SLAAC at backend).

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