Description

Glossary

RFCs

Publications

Obsolete RFCs

Description:

RFC 3344:

Agent Discovery is the method by which a mobile node determines whether it is currently connected to its home network or to a foreign network, and by which a mobile node can detect when it has moved from one network to another. When connected to a foreign network, the methods specified in this section also allow the mobile node to determine the foreign agent care-of address being offered by each foreign agent on that network.

Mobile IP extends ICMP Router Discovery as its primary mechanism for Agent Discovery. An Agent Advertisement is formed by including a Mobility Agent Advertisement Extension in an ICMP Router Advertisement message. An Agent Solicitation message is identical to an ICMP Router Solicitation, except that the IP TTL MUST be set to 1.

Mobile IP header:

Type. 8 bits.

Glossary:

Agent Advertisement.
(RFC 3220) An advertisement message constructed by attaching a special extension to a router advertisement message.

Authentication.
(RFC 3344) The process of verifying (using cryptographic techniques, for all applications in this specification) the identity of the originator of a message.

Authorization-enabling extension.
(RFC 3220) An authentication which makes a (registration) message acceptable to the ultimate recipient of the registration message. An authorization-enabling extension MUST contain an SPI.

Care-of Address.
(RFC 3220) The termination point of a tunnel toward a mobile node, for datagrams forwarded to the mobile node while it is away from home. The protocol can use two different types of care-of address: a "foreign agent care-of address" is an address of a foreign agent with which the mobile node is registered, and a "co-located care-of address" is an externally obtained local address which the mobile node has associated with one of its own network interfaces.

Correspondent Node.
(RFC 3220) A peer with which a mobile node is communicating. A correspondent node may be either mobile or stationary.

Foreign Agent.
(RFC 3220) A router on a mobile node's visited network which provides routing services to the mobile node while registered. The foreign agent detunnels and delivers datagrams to the mobile node that were tunneled by the mobile node's home agent. For datagrams sent by a mobile node, the foreign agent may serve as a default router for registered mobile nodes.

Foreign Network.
(RFC 3220) Any network other than the mobile node's Home Network.

Forward Tunnel.
(RFC 3024) A tunnel that shuttles packets towards the mobile node. It starts at the home agent, and ends at the mobile node's care-of address.

Gratuitous ARP.
(RFC 3344) An ARP packet sent by a node in order to spontaneously cause other nodes to update an entry in their ARP cache.

Home Address.
(RFC 3220) An IP address that is assigned for an extended period of time to a mobile node. It remains unchanged regardless of where the node is attached to the Internet.

Home Agent.
(RFC 3220) A router on a mobile node's home network which tunnels datagrams for delivery to the mobile node when it is away from home, and maintains current location information for the mobile node.

Home Network.
(RFC 3220) A network, possibly virtual, having a network prefix matching that of a mobile node's home address. Note that standard IP routing mechanisms will deliver datagrams destined to a mobile node's Home Address to the mobile node's Home Network.

Link.
(RFC 3220) A facility or medium over which nodes can communicate at the link layer. A link underlies the network layer.

Link-Layer Address.
(RFC 2002) The address used to identify an endpoint of some communication over a physical link. Typically, the Link-Layer address is an interface's Media Access Control (MAC) address.

MN, Mobile Node.
(RFC 3220) A host or router that changes its point of attachment from one network or subnetwork to another. A mobile node may change its location without changing its IP address; it may continue to communicate with other Internet nodes at any location using its (constant) IP address, assuming link-layer connectivity to a point of attachment is available.

MA, Mobility Agent.
(RFC 2002) Either a home agent or a foreign agent.

Mobility Binding.
(RFC 2002) The association of a home address with a care-of address, along with the remaining lifetime of that association.

Mobility Security Association.
(RFC 2002) A collection of security contexts, between a pair of nodes, which may be applied to Mobile IP protocol messages exchanged between them. Each context indicates an authentication algorithm and mode, a secret (a shared key, or appropriate public/private key pair), and a style of replay protection in use.

Node.
(RFC 2002) A host or a router.

Nonce.
(RFC 2002) A randomly chosen value, different from previous choices, inserted in a message to protect against replays.

Reverse tunnel.
(RFC 3024) A tunnel that starts at the mobile node's care-of address and terminates at the home agent.

SPI, Security Parameter Index.
(RFC 2002) An index identifying a security context between a pair of nodes among the contexts available in the Mobility Security Association. SPI values 0 through 255 are reserved and MUST NOT be used in any Mobility Security Association.

Tunnel.
(RFC 2002) The path followed by a datagram while it is encapsulated. The model is that, while it is encapsulated, a datagram is routed to a knowledgeable decapsulating agent, which decapsulates the datagram and then correctly delivers it to its ultimate destination.

Virtual network.
(RFC 2002) A network with no physical instantiation beyond a router (with a physical network interface on another network). The router (e.g., a home agent) generally advertises reachability to the virtual network using conventional routing protocols.

Visited network.
(RFC 2002) A network other than a mobile node's Home Network, to which the mobile node is currently connected.

Visitor list.
A list of the mobile nodes visiting a foreign agent.

RFCs:

[RFC 2005] Applicability Statement for IP Mobility Support.

• Category: Standards Track.

[RFC 2006] The Definitions of Managed Objects for IP Mobility Support using SMIv2.

• Category: Standards Track.
• Defines SNMP MIB iso.org.dod.internet.mgmt.mib-2.mipMIB (1.3.6.1.2.1.44).

[RFC 2977] Mobile IP Authentication, Authorization, and Accounting Requirements.

• Category: Informational.

[RFC 3012] Mobile IPv4 Challenge/Response Extensions.

• Category: Standards Track.

[RFC 3024] Reverse Tunneling for Mobile IP, revised.

• Category: Standards Track.
• Obsoletes:
  RFC 2344.

[RFC 3115] Mobile IP Vendor/Organization-Specific Extensions.

• Category: Standards Track.
• Obsoletes:
  RFC 3025.

[RFC 3344] IP Mobility Support for IPv4.

• Category: Standards Track.
• Obsoletes:
  RFC 3220.

[RFC 3519] Mobile IP Traversal of Network Address Translation (NAT) Devices.

• Category: Standards Track.
• Defines Mobile IP control messages 4 (MIP Tunnel Data Message), 42 (UDP Tunnel Reply Extension) and 142 (UDP Tunnel Request Extension).

[RFC 3543] Registration Revocation in Mobile IPv4.

• Category: Standards Track.
• Defines Mobile IP control messages 7 (Registration Revocation), 15 (Revocation Acknowledgment) and 137 (Revocation Support).

[RFC 3583] Requirements of a Quality of Service (QoS) Solution for Mobile IP.

• Category: Informational.

[RFC 3846] Mobile IPv4 Extension for Carrying Network Access Identifiers.

• Category: Standards Track.
• Defines Mobile IP control message 136 (NAI Carrying Extension).

[RFC 3957] Authentication, Authorization, and Accounting (AAA) Registration Keys for Mobile IPv4.

• Category: Standards Track.
• Defines Mobile IP control messages 40 (MN-FA-KeyGen Request), 41 (MN-FA-KeyGen Reply), 42 (MN-HA-KeyGen Request), 43 (MN-HA-KeyGen Reply).

[RFC 4064] Experimental Message, Extensions, and Error Codes for Mobile IPv4.

• Category: Standards Track.
• Defines Mobile IP control messages 127 (Non-skippable Extension for Experimental use) and 255 (Skippable Extension for Experimental use).

[RFC 4093] Problem Statement: Mobile IPv4 Traversal of Virtual Private Network (VPN) Gateways.

• Category: Informational.

[RFC 4332] Cisco's Mobile IPv4 Host Configuration Extensions.

• Category: Informational.

[RFC 4433] Mobile IPv4 Dynamic Home Agent (HA) Assignment.

• Category: Standards Track.
• Defines Mobile IP control messages 139 (Dynamic HA Extension).

Publications:

Obsolete RFCs:

[RFC 2002] IP Mobility Support.

• Category: Standards Track.
• Obsoleted by:
  RFC 3220.

[RFC 2344] Reverse Tunneling for Mobile IP.

• Category: Standards Track.
• Obsoleted by:
  RFC 3024.

[RFC 3025] Mobile IP Vendor/Organization-Specific Extensions.

• Category: Standards Track.
• Obsoleted by:
  RFC 3115.

[RFC 3220] IP Mobility Support for IPv4.

• Category: Standards Track.
• Obsoleted by:
  RFC 3344.
• Obsoletes:
  RFC 2002.

Description

Glossary

RFCs

Publications

Obsolete RFCs