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security policy discovery




Hello,

I've a question about IPsec and I'm not sure IPSP
is the answer, therefore I'm asking it in this list.

I assume Alice and Bob don't know each other, so
they have no security association. Alice doesn't care
about security, but Bob cares..

Alice sends a packet to Bob for the first time. It is not
an IKE, JKF packet. It is the actual packet of a session
(e.g. TCP SYN).

Bob doesn't want to communicate unless a security
association is established.

What happens in this case? Bob replies with IKE/JFK?
Or Alice detects Bob's security policy before attempting
to communicate?

Thank you in advance. And sorry if it is a too basic question
or this is not really in the scope of this WG...

Regards,

pars