Bi-directional Tunneling for Mobile IP

Document Type Expired Internet-Draft (individual)
Last updated 1996-09-09 (latest revision 1996-01-05)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The Mobile IP specification uses tunneling from the home agent to the mobile node, but rarely in the reverse direction. Usually, a mobile node sends its packets through a router in the foreign net, and assumes that routing is independent of source address. When this assumption is not true, it is convenient to establish topologically correct bi-directional tunnels between the home agent and the mobile node's care-of address. This document proposes backwards-compatible extensions to Mobile IP in order to support topologically correct bi-directional tunnels. This document does not attempt to solve the problems posed by firewalls located between the home agent and the mobile node's care-of address.


Gabriel Montenegro (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)