IL (network protocol)

The Internet Link protocol or IL is a connection-based transport-layer protocol designed at Bell Labs originally as part of the Plan 9 operating system and is used to carry 9P. It is assigned the Internet Protocol number of 40. It is similar to TCP but much simpler. Its main features are: * Reliable datagram service * In-sequence delivery * Internetworking using IP * Low complexity, high performance * Adaptive timeouts As of the Fourth Edition of Plan 9, 2003, IL is deprecated in favor of TCP/IP because it doesn't handle long-distance connections well.

The Internet Link protocol or IL is a connection-based transport-layer protocol designed at Bell Labs originally as part of the Plan 9 operating system and is used to carry 9P. It is assigned the Internet Protocol number of 40. It is similar to TCP but much simpler. Its main features are: Reliable datagram service In-sequence delivery Internetworking using IP Low complexity, high performance Adaptive timeouts As of the Fourth Edition of Plan 9, 2003, IL is deprecated in favor of TCP/IP because it doesn't handle long-distance connections well. struct IPIL { byte vihl; /* Version and header length */ byte tos; /* Type of service */ byte length[2]; /* packet length */ byte id[2]; /* Identification */ byte frag[2]; /* Fragment information */ byte ttl; /* Time to live */ byte proto; /* Protocol */ byte cksum[2]; /* Header checksum */ byte src[4]; /* Ip source */ byte dst[4]; /* Ip destination */ byte ilsum[2]; /* Checksum including header */ byte illen[2]; /* Packet length */ byte iltype; /* Packet type */ byte ilspec; /* Special */ byte ilsrc[2]; /* Src port */ byte ildst[2]; /* Dst port */ byte ilid[4]; /* Sequence id */ byte ilack[4]; /* Acked sequence */ };

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