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Note: Currently, JUNOSe software does not support configuration of the Mobile IP foreign agent. |
Mobile IP is a tunneling-based solution that enhances the utility of E-series routers at the edge of the network between fixed wire and wireless network domains. This tunneling-based solution enables a router on a user's home subnet to intercept and forward IP packets to users who roam beyond traditional network boundaries. Mobile IP is useful in environments where mobility is desired and the traditional land line dial-in model does not provide an adequate solution, and in environments where a wireless technology is used.
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Note: Currently, JUNOSe software does not support configuration of the Mobile IP foreign agent. |
Traditionally, IP addresses are associated with a fixed network location. To achieve mobility, the mobile node assumes a secondary IP address that matches the new network and redirects the traffic bound to the primary or home address to the mobile node's new network. In the Mobile IP architecture, the two agents that accomplish this task are the home agent and the foreign agent.
When a mobile node roams into a new network, it negotiates with the foreign agent to get a secondary IP address, which is referred to as the care-of address (CoA). The mobile node registers this CoA with the home agent. The home agent then establishes a tunnel to the CoA if the tunnel is not established earlier.
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Note: You need to establish only one tunnel between the home agent and the CoA. Demultiplexing of the traffic is done through IP address inspection. |
Packets sent to the home address of the mobile node are redirected by the home agent through the tunnel to the CoA at the foreign agent. The foreign agent routes the packets to the mobile node's home address. If the mobile node's home address is a private address or if the foreign agent implements ingress filtering, a reverse tunnel from the CoA to the home agent is required.
You can use the Mobile IP home agent feature to configure the home agent within a virtual router. The home agent handles the following tasks:
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