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Date:      Sat, 26 Jun 2021 18:25:45 -0700
From:      Doug Hardie <bc979@lafn.org>
To:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   IPv6 Sub Nets
Message-ID:  <056639D1-32A2-4DAF-A6F8-C8743F691EAD@sermon-archive.info>

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I am trying to setup an IPv6 environment.  There is a primary router (A) =
that receives a /48 prefix via DHCP6 from the ISP.  That router =
configures itself properly via dhcp6c.  It also creates 2 LAN /64 =
prefixes and creates EUI-64 addresses on the two LAN interfaces.  One of =
those interfaces is connected to a second router (B), among other =
devices.  The B router receives the prefix via SLAAC and creates its own =
EUI-64 address.  However, that router needs to create a smaller subnet, =
/72, and distribute it to the devices on that LAN.  I have not been able =
to figure out how to make that happen. =20

Clearly, manual configuration would work, but the prefix received from =
the ISP can change which would raise havoc with the network.  I suspect =
that dhcp6s needto be run alongside dhcp6c on router B and then the =
other devices run dhcp6c.  However, I don't see how to get the prefix =
that dhcp6c receives on router B to the dhcp6s process on router B.  I =
believe I am missing something, but haven't been able to find it.  =
Thanks,

-- Doug




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