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Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Internet Layer (OSI Network Layer) Protocols
           9  Internet Protocol (IP/IPv4, IPng/IPv6) and IP-Related Protocols (IP NAT, IPSec, Mobile IP)
                9  Internet Protocol Mobility Support (Mobile IP)

Previous Topic/Section
Mobile IP Agent Discovery, and Agent Advertisement and Solicitation Messages
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Pages in Current Topic/Section
12
3
4
Next Page
Mobile IP Data Encapsulation and Tunneling
Next Topic/Section

Mobile IP Home Agent Registration and Registration Messages
(Page 3 of 4)

Registration Request Message Format

Registration Request messages have the format shown in Table 83 and Figure 132.


Figure 132: Mobile IP Registration Request Message Format

This message is carried in the payload of a User Datagram Protocol (UDP) message, the headers of which are not shown.

 



Table 83: Mobile IP Registration Request Message Format

Field Name

Size (bytes)

Description

Type

1

Type: Identifies the registration message type. For a request, this field is 1.

Flags

1

 

Lifetime

2

Lifetime: Length of time, in seconds, that the mobile node requests from the home agent for this registration.

Home Address

4

Home Address: The home (normal) IP address of the mobile node when on its home network. Uniquely identifies the device regardless of how the request is conveyed to the home agent.

Home Agent

4

Home Agent: The IP address of the device acting as the mobile node's home agent.

Care-Of Address

4

Care-Of Address: The IP address being used by the mobile node as its care-of address.

Identification

8

Identification: A 64-bit number that uniquely identifies the Registration Request and is used to match requests to replies. It also provides protection against replay attacks; see the topic on Mobile IP security issues for more.

Extensions

Variable

Extensions: Extension fields are included here for authentication of the request. Other extensions may also be included.


Related Information: See the topic on Mobile IP encapsulation for more on minimal and GRE encapsulation and reverse tunneling.



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Mobile IP Agent Discovery, and Agent Advertisement and Solicitation Messages
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Next Page
Mobile IP Data Encapsulation and Tunneling
Next Topic/Section

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