[Starlink] dhcpv6-pd details

[Nick Buraglio]

As discussed privately with Dave, I have removed the starlink provided
router and replaced it with a Mikrotik RB2011 to allow for more
granular control, and to better tie into my existing network. This has
allowed me to make a dhcpv6-pd request that is reasonably stable (so
far it has changed once in the last 2 months). The lease time is
incredibly short, which is a little strange but as long as the DHCPv6
server is the same and remains unchanged, it should just hand out the
same prefix upon request.
I also built a very crude measurement display that just uses curl get
and dig via smokeping to display reasonable RTT. It's detailed in the
reddit post here:
https://www.reddit.com/r/Starlink/comments/mykxjv/functional_ipv6_and_some_crude_starlink_latency/
and can be viewed directly here:
https://starmon.qosbox.com/

Making dhcpv6-pd work is pretty standard:

/ipv6 dhcp-client

add add-default-route=yes interface=ether2 pool-name=starlink-ipv6
prefix-hint=::/56 request=prefix

On each interface you want to have IPv6 on:

/ipv6 address

add address=::1 from-pool=starlink-ipv6 interface=bridge.8

add address=::1 from-pool=starlink-ipv6 interface=bridge.6