Agent Faq – Troubleshooting
It is feasible to have two privately addressed mobile nodes with the identical IP tackle residing on the same overseas network. This scenario is simply attainable when each mobile node has a special home agent.
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Also, this example is only potential when each mobile node is on completely different promoting subnets of a single overseas agent. The following illustration reveals a community topology that depicts this case. The cellular node makes use of a special registration process to keep its home agent knowledgeable about its present location. Whenever a cellular node strikes from its house community to a foreign network, or from one international community to another, it chooses a international agent on the brand new network and makes use of it to forward a registration message to its house agent. The care-of tackle may belong to a overseas agent, or might be acquired by the mobile node via Dynamic Host Configuration Protocol (DHCP) or Point-to-Point Protocol (PPP).
The cellular node does this by setting the reverse tunnel flag on within the cellular node’s registration request. When the cell node receives an agent advertisement, the cellular node registers via the overseas agent, even when the cellular node may be able to acquire its personal co-positioned care-of tackle. This characteristic enables websites to limit access to mobility companies.
Through agent ads, cellular nodes detect when they have moved from one subnet to a different. A mobile node acquires a co-located care-of handle as an area IP address via some exterior means, which the mobile node then associates with certainly one of its own network interfaces. The handle may be dynamically acquired as a brief tackle by the mobile node, such as by way of DHCP. The tackle might also be owned by the mobile node as an extended-time period address for its use solely while visiting some foreign community. When utilizing a co-located care-of tackle, the cell node serves as the endpoint of the tunnel and performs de-encapsulation of the datagrams tunneled to it.
Also, a reverse tunnel might be required by either the international agent or the home agent. If the overseas agent helps reverse tunneling, the cell node makes use of the registration course of to request a reverse tunnel.