Selective Routing for the Mobile IP LAN Protocol

摘要

Mobile Internet Protocol (IP) Local Area Network (LAN) is a technique developed by the U.S. Army Research Laboratory which allows a LAN to be IP mobile when it attaches to a foreign IP-based network and uses this network as a means to retain connectivity to its home network. This technique is a form of virtual private networking which enables a LAN to roam on the Internet. In this report, we describe implementation of selective routing for the Mobile IP LAN technique in order to improve network communications for a mobile LAN. The selective routing implementation performs network address translation to route selected network application packets based on IP address (layer 3 address) or transport identifier (layer 4 port) through the foreign network. All other traffic is tunneled to the home network for routing, as in the conventional implementation of Mobile IP LAN. This improves the network latency for those applications that do not specifically require the IP and transport layers to be intact. To evaluate the performance of the Mobile IP LAN with selective routing technique, we have implemented the following three different scenarios in which we vary the Internet connection of Mobile LAN: direct LAN-to-LAN connection at the home network, connection at a foreign network using the secure mobile IP LAN technique, and connection at a foreign network using the secure Mobile IP LAN with selective routing technique. We compare the data rates of file transfers between a node on the mobile LAN and a node on the Internet in these three cases.