An extension to the IETF MIB module defined in
RFC-2006 for managing Mobile IP implementations.
Mobile IP introduces the following new functional
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
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.
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.
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.
Network that moves with the mobile router.
Following is the terminology associated with Mobile IP
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
A peer with which a mobile node is communicating.
A correspondent node may be either mobile or
Any network other than the mobile node's Home
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.
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.
Either a home agent or a foreign agent.
The association of a home address with a care-of
address, along with the remaining lifetime of that
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.
A host or a router.
A randomly chosen value, different from previous
choices, inserted in a message to protect against
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.
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.
A network other than a mobile node's Home Network,
to which the mobile node is currently connected.
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
The following support services are defined for
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.
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.
A binding update contains the registration request
information. The home agent sends the update to its
peer after accepting a registration.
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.
3rd Generation Partnership Project 2. This is
the standardization group for CDMA2000, the set of 3G
standards based on earlier 2G CDMA technology.
Worldwide Interoperability for Microwave Access,
Inc. (group promoting IEEE 802.16 wireless broadband
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.