1.Existing address
spaces must coexist
2.Some port
multiplexing is unavoidable in IPv4
3.Renumbering should
be easy
4.Privacy of
customer sites must be possible
5.Multihoming must
be supported
-Multi-address
protocols should work (SCTP, SHIM6)
-Compatibility
with reverse path forwarding (RPF) is needed (RFC
3704)
6.A unique mechanism
with a few parameters is better
than several mechanisms (less specifications,
less code, less validations, less training…)
7.