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NAT-T ipaddress conflict



Hi, 

NAT-Traversal and UDP-Encapsulation drafts do not suggest a way to deal
with IP address conflict behind two different NATs. The recent draft
"draft-ietf-ipsec-udp-encaps-02.txt" also says that that the
implementations should devise their own way to solve this problem.  (in
section 5.2 — Tunnel Mode Conflict)

Are there any references available suggesting a solution to this issue?
I read that NAT functionality built-in into the ipsec stack on the VPN
GW solves this problem. Could somebody provide an overview (or already
available stuff on the web)

TIA,
Umasankar.