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Dest addr. in tunnel mode



When referring to "IPv4 -- Header Construction for Tunnel Mode" RFC 2401
says:

----------------------------
3. src and dest addresses depend on the SA, which is used to
   determine the dest address which in turn determines which src
   address (net interface) is used to forward the packet.
-----------------------------

Nowhere else is said that the SA MUST contain the dest address...
Or maybe I didn't see it?...

Thanx for your prompt answer
Cristian