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IPSec - Mobile IP users...


I have some questions re: IPSec wrt. to mobile users.

1) Do mobile users need IKE and DHCP to use IPSec ?  whats the general
    by customers ?

2) (a)  When mobile users login, they normally dial-in to a Gateway.
Does IPSec need to be
    enabled and used between the Gateway and the mobile user ?  If so,
it is always in transport mode of
    IPSec ?

     (b)  Does the mobile user need to have two IPSec Sessions - one to
the Gateway and other to the
            end (destination/termination) host ?  If so, can Sessions be
of tunnel mode ?

3) Any documents/website/ pointers on information on IPSec wrt. mobile
users ?

Thank you.