home agent and foreign agent

词汇：

mechanism 机械 构造
maintain 坚持，维持继续，断言，主张
conjunction 连接 结合
glossary 词汇，术语

home agent

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In Mobile Internet Protocol (MobileIP), a home agent is a router on amobilenode's homenetwork that maintains information about the device's current

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location, as identified in its care-ofaddress. The home agent uses tunnelingmechanisms to forward Internet traffic so that the device's IPaddress doesn't have to be changed each time it connects from a different location. A homeagent may work in conjunction with a foreignagent, which is a router on the visited network. The foreign agent and the home agent are twotypes of mobilityagents, defined in the Internet Engineering Task Force (IETF) RFC 2002specification called IP Mobility Support.

Related glossary terms:iDEN (Integrated Digital Enhanced Network), 802.11a, spectrum analyzer, radio frequency (RF, rf, orr.f.), repeater

foreign agent:

In Mobile Internet Protocol (MobileIP), a foreignagent is a routerserving as a mobilityagent for a mobilenode. As specified in IETF RFC 2002), aforeign agent works in conjunction with another type of mobility agent known as a

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home agentto support Internet traffic forwarding for a device connecting to the Internet from any locationother than its homenetwork.

The home agent tunnels datagrams (packets)intended for the mobile node to a care-ofaddress, which is either the IPaddress for the foreign agent, or an IP address acquired through some external means, such asDynamic Host Configuration Protocol (DHCP).The foreign agent detunnels packets and delivers them to the mobile node.

The operational mode using the foreign agent's static IP address as the care-of address wasfavored in the Internet Protocol version 4 (IPv4) environment (which has a limited number of IPaddresses available), because it meant that many devices could use the same care-of address.However, because Internet Protocol version 6 (IPv6)virtually does away with address constraints, Mobile IPv6 (MIPv6) minimizes the use of foreignagents.

Related glossary terms:wireless backhaul, home agent, DECT (Digital Enhanced Cordless Telecommunications), CDPD (Cellular Digital Packet Data), 802.11a, spread spectrum, Multichannel Multipoint Distribution Service (MMDS), Link Quality Source Routing (LQSR), USSD (Unstructured Supplementary Service Data), Wi-Fi Multimedia (WMM)

Last Updated: 12 Sep 2002