On 9 Feb 2011, at 09:48, sthaug@nethelp.no wrote:
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.
Can you elaborate on this? What's the ping-pong problem? Sam (who's experience is pretty much mostly ethernet)