Tunnel Type Change for Mobile IPv4 (TTC)

Document Type Expired Internet-Draft (individual)
Authors Alexandre Petrescu  , Christophe Janneteau  , Nicolas Demailly 
Last updated 2011-03-07
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Expired & archived
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The protocol Mobile IPv4 may use a number of encapsulation methods between an MN and its HA. The UDP method is used to perform NAT Traversal (if a NAT sits between MN and HA) whereas IP-in-IP method may be used if there is no NAT (CoA is a publicly routable address). Although these methods are individually specified, a mechanism for changing between one to another is not, which may lead to incoherent implementations. This draft briefly presents the scenario of a MN performing a handover between private space (NAT) and public space (non-NAT), the implementation problem (type of tunnel can not be changed dynamically), and some potential solutions as textual modifications, better implementations, or protocol extensions.


Alexandre Petrescu (alexandru.petrescu@cea.fr)
Christophe Janneteau (christophe.janneteau@cea.fr)
Nicolas Demailly (nicolas.demailly@ixxi.biz)

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