ipv6/ppp: FreeBSD obtains linklocal on tun0 only

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My ISP is offering IPv6 only "as an experimental feature", so I had to ask to enable the
IPv6 stack on my connection. I'm using FreeBSD 12-STABLE as the basis for a
router/firewall/PBX system, FreeBSD's onboard ppp client is performing the uplink and
authetication and this works well with IPv4 for years for now.

I'm using IPFW as my filtering system, reading the standard /etc/rc.ipfirewall and add
some custom rules regarding my setup.

As far as I know, with the IPv4 stack a IPv4 address is obtained automatically, so I
would expect the same for IPv6.

I'm new to IPv6 and I've trouble with my provider for a long time now, so there is a
slight possibility that my ISP is not truthful on what they say. On the other hand, there
is still a high probability that I do something wrong. I need need to send this ahead,
before continueing.

When booting off, I see the classic tun0 uplink with

MYADDR -> HISADDR

For IPv6, I only see my local linklocal address, fe80::... 

Checking the log of ppp (/var/log/ppp.log), there is also a fe80:: linklocal address
assigned to the variable HISADDR. Somehow, the tun0 never obtains a IPv6 aprefix so far.

Can someone give a tip?

Regards,

oh
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