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IPv6 addressing for core network
> Is there a NANOG FAQ we can add this to?
> > 1- Use Public Ipv6 with /122 and do not advertise to Internet
> > 2- Use Public Ipv6 with /127 and do not advertise to Internet
> The all zeros address is the all routers anycast address so on most non-Cisco routers you can't use it, ruling out /127. The top 128 addresses in any subnet are also reserved anycast addresses although they don't do much in practice. So the longest prefix length you should use is /120 and only use addresses 1 - 127.
A /127 mask is still the best way to handle real point-to-point links
like SDH/SONET today, to avoid the ping-pong problem. Works fine with
Cisco and Juniper, not tried with other vendors.
Steinar Haug, Nethelp consulting, sthaug at nethelp.no