Hajimu UMEMOTO 0a5f3ef410 Changed the behavior when an interface-direct prefix being advertised
was removed from the kernel;
Advertise the prefix with zero lifetimes rather than to remove the prefix
from the prefix list to be advertised.
This will help renumber a receiving host by deprecating the address
derived from the old prefix.

Obtained from:	KAME
MFC after:	2 weeks
2002-06-13 16:59:31 +00:00
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