IPv4/IPv6 Translation

As the Internet makes the transition from IP version 4 to IP version 6, it will be necessary to allow IPv4-based clients to access IPv6-based servers, and IPv6-based clients to access legacy services. Network Address Translation - Protocol Translation (NAT-PT) can provide network protocol translation, and Application Layer Gateways (ALGs) can handle the cases where peer addresses are embedded in application-layer messages. We describe an implementation on a Linux router/translation server, the necessary configuration of the IPv4 and IPv6 environments, and the operation of ALGs for the File Transfer Protocol and for the Session Initiation Protocol. We will present a demonstration of basic communication (web client to web server), and of multimedia communication (based on the open-source VOCAL project).

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