What is FA (Foreign Agent)?

The foreign agent can offer a few types of assistance to the portable node during its visit to the foreign network. Foreign agent can likewise give security administrations since they belong to the foreign network as opposed to the MN which is only visiting.
A Foreign Agent is a node in a MIP (Mobile IP) network that empowers roaming IP clients to register on the foreign network. The FA will communicate with the Home Agent to empower IP datagrams to be conveyed between the home IP network and the roaming IP client on the foreign network. A security connection between the home agent (HA) and the foreign agent (FA) is required. FA local routing will not occur if there is no security association configured.