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 (Mobile IP ), a home agent is a router on a mobile node 's home network that maintains information about the device's current

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location, as identified in its care-of address . The home agent uses tunneling mechanisms to forward Internet traffic so that the device's IP address doesn't have to be changed each time it connects from a different location. A home agent may work in conjunction with a foreign agent , which is a router on the visited network. The foreign agent and the home agent are two types of mobility agent s, defined in the Internet Engineering Task Force (IETF ) RFC 2002 specification 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 (Mobile IP ), a foreign agent is a router serving as a mobility agent for a mobile node . As specified in IETF RFC 2002), a foreign agent works in conjunction with another type of mobility agent known as a

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home agent to support Internet traffic forwarding for a device connecting to the Internet from any location other than its home network .

The home agent tunnels datagrams (packet s) intended for the mobile node to a care-of address , which is either the IP address for the foreign agent, or an IP address acquired through some external means, such as Dynamic 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 was favored in the Internet Protocol version 4 (IPv4) environment (which has a limited number of IP addresses 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 foreign agents.

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