2. Compression mechanisms

2.1 TCP/IP header compression

For many years, the Van Jacobson (VJ) proposal was the only compression mechanism available. Its main feature is the elimination of information redundancy between successive headers of a TCP/IPv4 flow. The VJ mechanism consists in transmitting the differential between two consecutive packet headers on the same TCP connection, with only the fields that have changed being transmitted. At the start of transmission, the compressor will send packets with the original header to establish the context in the decompressor; it then uses the packets with the compressed header....