What is mobile node? - Definition from popttartss.tk

 

mobile node

How Mobile IP Works. Mobile IP enables routing of IP datagrams to mobile nodes. The mobile node's home address always identifies the mobile node, regardless of its current point of attachment to the Internet or an organization's network. When away from home, a care-of address associates the mobile node with its home address by providing information about the mobile node's current point of. In this article, we'll discuss the current state of bringing popttartss.tk to mobile, the benefits that popttartss.tk would bring on mobile and a new, potential solution to enabling popttartss.tk development for mobile popttartss.tk: Brian Rinaldi. May 01,  · A mobile node is an Internet-connected device whose location and point of attachment to the Internet may frequently be changed. This kind of node is often a cellular telephone or handheld or laptop computer, although a mobile node can also be a popttartss.tkl support is required to maintain Internet connections for a mobile node as it moves from one network or subnet to another, because.


Introduction to Mobile IP - Cisco


Mobile IP enables routing of IP datagrams to mobile nodes. The mobile node's home address always identifies the mobile node, mobile node, regardless of its current point of attachment to the Internet or an organization's network. When away from home, a care-of address associates the mobile node with its home address by providing information about the mobile node's current point of attachment to the Internet or an organization's network.

Mobile IP uses a registration mechanism to register the care-of address with a home agent, mobile node.

The home agent redirects datagrams from the home mobile node to the care-of address by constructing a new IP header that contains the mobile node's care-of address as the mobile node IP address.

This new header then encapsulates the original IP datagram, causing the mobile node's home address to have no effect on the encapsulated datagram's routing until it arrives at the care-of address.

This type of encapsulation is also called tunneling. After arriving at the care-of address, each datagram is de-encapsulated and then delivered to the mobile node. The following illustration shows a mobile node residing on its home network, Network A, before the mobile node moves to a foreign network, Network B.

Both networks support Mobile IP, mobile node. The mobile node is always associated with its home network by its permanent IP address, Though Network A has a home agent, mobile node, datagrams destined for the mobile node are delivered through the normal IP process. The following illustration shows the mobile node moving to a foreign network, mobile node, Network B.

Datagrams destined for the mobile node are intercepted by the mobile node agent on the home network, Network A, encapsulated, and sent to the foreign agent on Network B. Upon receiving the encapsulated datagram, the foreign agent strips off the outer header and delivers the datagram to the mobile node visiting Network B.

In the latter case, a mobile node is said to have a co-located care-of address. The mobile node uses a special registration process to keep its home agent informed about its current location. Whenever mobile node mobile node moves from mobile node home network to a foreign network, mobile node, or from mobile node foreign network to another, it chooses a foreign agent on the new network and uses it to forward a registration message to its home agent, mobile node.

Mobility agents home agents and foreign agents advertise their presence using agent advertisement messages. A mobile node can optionally solicit an agent advertisement message from any locally attached mobility agents through an agent solicitation message. A mobile node receives these agent advertisements and determines whether they are on its home network or a foreign network.

When the mobile node detects that it is located on its home network, it operates without mobility services. If returning to its home network from being registered mobile node, the mobile node node deregisters with its home agent.

The previous description of Mobile IP assumes that the routing within the Internet is independent of the data packet's source address, mobile node. However, intermediate routers might check for a topologically correct source address. If an intermediate router does check, mobile node, you should set up a reverse tunnel.

By setting up a reverse tunnel from the mobile node's care-of address to the home agent, you ensure a topologically correct source address for the IP data packet.

A mobile node can request a reverse tunnel between its foreign agent and its home agent when the mobile node registers. A mobile node tunnel is a tunnel that starts at the mobile node's care-of address and terminates at the home agent. The following illustration shows the Mobile IP topology that uses a reverse tunnel, mobile node. Mobile nodes that have private addresses which are not globally routable through the Internet require reverse tunnels. Solaris Mobile IP supports only privately addressed mobile nodes.

Enterprises employ private addresses when external connectivity is not required. Private addresses are not routable through the Internet. When a mobile node has a private address, the mobile node can only communicate with a correspondent node through a reverse tunnel. The privately addressed correspondent node must belong to the same home agent's administrative domain, mobile node. The following illustration shows a network topology with two privately addressed mobile nodes that use the same care-of address when registered to the same foreign agent.

Because both privately addressed mobile nodes belong to the same administrative domain, the home agent knows how to route data packets between the two mobile nodes. Also, the foreign agent's care-of address and the home agent's IP address must be globally routable addresses.

It is possible to have two privately addressed mobile nodes with the same IP address mobile node on the same foreign network.

This situation is only possible when each mobile node has a different home agent. Also, this situation is only possible when each mobile node is on different advertising subnets of a single foreign agent. The following illustration shows a network topology that depicts this case. Because both privately addressed mobile nodes have the same IP address and because these mobile nodes belong to different home agent domains, mobile node, the two nodes cannot communicate with each other, mobile node.

However, each node can communicate with nodes in its corresponding home agent's administrative domain through the reverse tunnel. For example, Mobile Node 2 can communicate with Correspondent Node 2 in the previous illustration. Figure 1—5 Privately Addressed Mobile Nodes Residing on the Same Foreign Network Because both privately addressed mobile nodes belong to the same administrative domain, the home agent knows how to route data packets between the two mobile node nodes.

Figure 1—6 Privately Addressed Mobile Nodes Residing on Different Foreign Networks Because both privately addressed mobile nodes have the same IP address and because these mobile nodes belong to different home agent domains, the two nodes cannot communicate with each other.

 

How Mobile IP Works (Mobile IP Administration Guide)

 

mobile node

 

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