CISCO-MOBILE-IP-MIB
An extension to the IETF MIB module defined in RFC-2006 for managing Mobile IP implementations. Mobile IP introduces the following new functional entities: Mobile Node(MN) 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. Home Agent(HA) 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. Foreign Agent(FA) 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. Mobile Router(MR) A mobile node that is a router. It provides for the mobility for one or more networks moving together. The nodes connected to the network server by the mobile router may themselves be fixed nodes, mobile nodes or routers. Mobile Network Network that moves with the mobile router. Following is the terminology associated with Mobile IP protocol: Agent Advertisement An advertisement message constructed by attaching a special Extension to a router advertisement message. Care-of Address (CoA) 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' (CCoA) is an externally obtained local address which the mobile node has associated with one of its own network interfaces. Correspondent Node A peer with which a mobile node is communicating. A correspondent node may be either mobile or stationary. Foreign Network Any network other than the mobile node's Home Network. Home Address 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 Network 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. Mobility Agent Either a home agent or a foreign agent. Mobility Binding The association of a home address with a care-of address, along with the remaining lifetime of that association. Mobility Security Association 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 A host or a router. Nonce A randomly chosen value, different from previous choices, inserted in a message to protect against replays. Security Parameter Index (SPI) 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 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. Visited Network A network other than a mobile node's Home Network, to which the mobile node is currently connected. Visitor List The list of mobile nodes visiting a foreign agent. Keyed Hashing for Message Authentication (HMAC) A mechanism for message authentication using cryptographic hash functions. HMAC can be used with any iterative cryptographic hash function, e.g., MD5, SHA-1, in combination with a secret shared key. The following support services are defined for Mobile IP: Agent Discovery Home agents and foreign agents may advertise their availability on each link for which they provide service. A newly arrived mobile node can send a solicitation on the link to learn if any prospective agents are present. Registration When the mobile node is away from home, it registers its care-of address with its home agent. Depending on its method of attachment, the mobile node will register either directly with its home agent, or through a foreign agent which forwards the registration to the home agent. Following is the terminology associated with the home agent redundancy feature: Peer Home Agent Active home agent and standby home agent are peers to each other. Binding Update A binding update contains the registration request information. The home agent sends the update to its peer after accepting a registration. Binding Information Binding information contains the entries in the mobility binding table. The home agent sends a binding information request to its peer to retrieve all mobility bindings for a specified home agent address. This MIB is organized as described below: The IETF Mobile IP MIB module [RFC-2006] has six main groups. Three of them represent the Mobile IP entities i.e. 'MipFA': foreign agent, 'MipHA': home agent and 'MipMN': mobile node. Each of these groups have been further subdivided into different subgroups. Each of these subgroups is a collection of objects related to a particular function, performed by the entity represented by its main group e.g. 'faRegistration' is a subgroup under group 'MipFA' which has collection of objects for registration function within a foreign agent. This MIB also follows the same hierarchical structure to maintain the modularity with respect to Mobile IP.