Security Association
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... occur as a result of the first message sent to a destination.
Establishing security associations with all possible sources of
ICMPv6 messages is therefore impossible.
...
... ICMPv6 messages is therefore impossible.
The inability to establish security associations to protect some
messages that are needed to establish and maintain communications
means that alternative means have to be used to reduce the
...
... of local ICMPv6 communications. SEND sidesteps security association
bootstrapping problems that would result if IPsec was used. SEND ...