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URL: http://www.ietf.org/rfc/rfc2356.txt
The
Mobile IP specification establishes the mechanisms that enable a mobile host to
maintain and use the same IP address as it changes its point of attachment to
the network. Mobility implies higher security risks than static operation,
because the traffic may at times take unforeseen network paths with unknown or
unpredictable security characteristics. The Mobile IP specification makes no
provisions for securing data traffic. The mechanisms described in this document
allow a mobile node out on a public sector of the internet to negotiate access
past a SKIP firewall, and construct a secure channel into its home network.
In
addition to securing traffic, our mechanisms allow a mobile node to roam into
regions that (1) impose ingress filtering, and (2) use a different address
space.
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