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Hub & Spokes Security Model (Trusted)
CPE
Softwire
Host
User’ Home
ISP Network
Access Network
AF(i)
SI
PPP/L2TP/UDP/IP
AAA
Authentication can be turned off when already authenticated by other means.
PPP Authentication (CHAP)
DoS
TRUSTED
AF(i,j)
AF(i)
AF(j)
Mutual Authentication SHOULD be offered. (optionally one side)
PPP Encryption (ECP)
Voluntary Tunnel
PPT Version