Copyright (c) 1983, 1986 The Regents of the University of California.
All rights reserved.

Redistribution and use in source and binary forms are permitted
provided that the above copyright notice and this paragraph are
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THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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@(#)f.t 6.4 (Berkeley) 03/07/89

.nr H2 1 .ds RH Acknowledgements

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The internal structure of the system is patterned after the Xerox PUP architecture [Boggs79], while in certain places the Internet protocol family has had a great deal of influence in the design. The use of software interrupts for process invocation is based on similar facilities found in the VMS operating system. Many of the ideas related to protocol modularity, memory management, and network interfaces are based on Rob Gurwitz's TCP/IP implementation for the 4.1BSD version of UNIX on the VAX [Gurwitz81]. Greg Chesson explained his use of trailer encapsulations in Datakit, instigating their use in our system. .ds RH References
.nr H2 1

\s+2References\s0

Boggs, D. R., J. F. Shoch, E. A. Taft, and R. M. Metcalfe; PUP: An Internetwork Architecture. Report CSL-79-10. XEROX Palo Alto Research Center, July 1979. Bolt Beranek and Newman; Specification for the Interconnection of Host and IMP. BBN Technical Report 1822. May 1978. Cerf, V. G.; The Catenet Model for Internetworking. Internet Working Group, IEN 48. July 1978. Clark, D. D.; Window and Acknowledgement Strategy in TCP, RFC-813. Network Information Center, SRI International. July 1982. Digital Equipment Corporation; DECnet DIGITAL Network Architecture - General Description. Order No. AA-K179A-TK. October 1980. Gurwitz, R. F.; VAX-UNIX Networking Support Project - Implementation Description. Internetwork Working Group, IEN 168. January 1981. International Organization for Standardization. ISO Open Systems Interconnection - Basic Reference Model. ISO/TC 97/SC 16 N 719. August 1981. Joy, W.; Fabry, R.; Leffler, S.; McKusick, M.; and Karels, M.; Berkeley Software Architecture Manual, 4.3BSD Edition. UNIX Programmer's Supplementary Documents, Vol. 1 (PS1:6). Computer Systems Research Group, University of California, Berkeley. May, 1986. Leffler, S.J. and Karels, M.J.; Trailer Encapsulations, RFC-893. Network Information Center, SRI International. April 1984. Postel, J. User Datagram Protocol, RFC-768. Network Information Center, SRI International. May 1980. Postel, J., ed. Internet Protocol, RFC-791. Network Information Center, SRI International. September 1981. Postel, J., ed. Transmission Control Protocol, RFC-793. Network Information Center, SRI International. September 1981. Postel, J. Internet Control Message Protocol, RFC-792. Network Information Center, SRI International. September 1981. Xerox Corporation. Internet Transport Protocols. Xerox System Integration Standard 028112. December 1981. Zimmermann, H. OSI Reference Model - The ISO Model of Architecture for Open Systems Interconnection. IEEE Transactions on Communications. Com-28(4); 425-432. April 1980.