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Migrating to IPv6: A Practical Guide to Implementing IPv6 in Mobile and Fixed Networks by Marc Blanchet

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Overview

MobileIP process is very similar to the call forwarding function in telephony, as illustrated in Figure 11.2 and Table 11.1.

Alice knows Bob's primary telephone number (1). If Bob moves to another location (3) where he has another phone number, then he configures the switch to forward the calls coming for its primary number to its remote phone number (4). Alice still knows Bob's primary telephone number, but an agent, the switch, takes care of forwarding Bob's calls to him (6). If Bob moves again, he only needs to change the configuration of the switch to forward calls to the new phone number, without having to tell Alice and all his correspondents about where he is now.

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Figure 11.2 Call forwarding

Table 11.1 Equivalence between MobileIP and call forwarding

Call Forwarding Function MobileIP Function
Primary phone number Home IP address
Primary switch Home agent (HA)
Process to register the new phone number Binding update (BU)
New phone number Care-of-address (CoA)
Correspondent Correspondent node (CN)
Mobile user Mobile node (MN)

MobileIP Terminology

In the MobileIP context and terminology,

  • the primary telephone number is the node home IP address;
  • the switch is the home agent (HA), which is usually a router on the home network;
  • the process to register your new telephone number is the binding update (BU);
  • the correspondent (Alice) is the correspondent ...

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