The IPv?Interface methods are part of the ipadress module which is
based on ipaddr but include changes requested by the core python devs.
That code can be found at
http://code.google.com/p/ipaddress-py
(renamed thus because of the backwards incompatibility issues).
Cheers,
peter
--
Peter Moody Google
1.650.253.7306
Security Engineer pgp:0xC3410038