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IPv6 addressing for core network

> > 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? 

This has been well covered in the past. See


It's a problem for real point-to-point links like SDH/SONET which
don't use Neighbor Discovery.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no