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Options for SA establishment
AAA based access authentication?
Used in 3GPP2
A way to derive keys which can be used later for Mobile IPv6 BU

SEND-based
Public hotspots?

IKE?
Issue: Certificate provisioning between MN and an arbitrary visited network router

EAP-based keying?
EAP-over-any-access-network?
Keep Type-specific authentication mechanism open

Note: specifying a single mechanism appears not worthwhile. Instead, a framework may be the best option available
PPT Version