An IBM 360/370 Implementation of the Internet and TCP Protocols -- Design Specifications
Final technical rept. Oct 1977-Mar 1979
CALIFORNIA UNIV LOS ANGELES OFFICE OF ACADEMIC COMPUTING
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A family of internet host-to-host protocols has recently been defined to allow computer communications across interconnected packet networks with diverse properties. This interact protocol family is defined in two distinct levels. The lower level, Internetwork Protocol or IP, provides simple datagram service. Transmission Control Protocol or TCP is a higher-level internet protocol that uses IP for data transport. TCP provides connections, strong end- to-end control, flow control, and a form of out-of-band signalling. The IPTCP combination is intended to be the successor to the original ARPANET Host-to-Host Protocol AHHP. Under ARPA contract, UCLA has implemented Version 4 of the IP and TCP protocols for an IBM 360370 host computer on the ARPANET. This implementation is integrated into the existing Network Control Program for AHHP, and was designed to be compatible at the system-call interface so that existing user-level protocol programs can be used interchangeably with AHHP and IPTCP. The implementation is layered to match the protocols. This document gives a technical overview of the UCLA IPTCP implementation. It describes the NCP software environment, the resolution of compatibility issues, and the design of both the IP and TCP layers.
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