My ISP (Time Warner Cable) hands out IPv6 addresses with DHCPv6;
it will delegate a /56 if asked. So long as I keep refreshing the lease,
it won't renumber me. I have my cable modem set to bridge, and do all the
firewalling, NATing, etc., on a Debian box.
In what follows,
eth0 is the internal interface.
The dhclient that ships with debian/ubuntu does not support asking for a prefix delegation, so I had to build one from sources.
- Get the ISC dhcp source.