Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 beta 3/9/83; site sdcrdcf.UUCP
Path: utzoo!linus!security!genrad!grkermit!masscomp!clyde!floyd!harpo!seismo!hao!hplabs!sdcrdcf!darrelj
From: darrelj@sdcrdcf.UUCP
Newsgroups: net.micro.pc
Subject: Re: LANs and IP/TCP
Message-ID: <792@sdcrdcf.UUCP>
Date: Mon, 23-Jan-84 11:16:00 EST
Article-I.D.: sdcrdcf.792
Posted: Mon Jan 23 11:16:00 1984
Date-Received: Fri, 27-Jan-84 08:40:43 EST
References: <15853@sri-arpa.UUCP>
Reply-To: darrelj@sdcrdcf.UUCP (Darrel VanBuer)
Organization: System Development Corporation, Santa Monica
Lines: 29

LAN and protocol are mostly independent issues, since the only thing
required is to define some encapsulation into the LAN transport.
Ethernet packets include a 16-bit protocol identifier, and there are
assigned codes for PUP, DOD IP, Xerox NS and probably others.
4.2 bsd specifically supports many TCP/IP services (SUN is especially
committed to this, it's how they connect their workstations together).
Symbolics (lisp machine mfg) also supports TCP/IP on their machines as well
as several large mainframes (VAX unix, VAX VMS, TOPS-20).  The only real
complication in putting TCP/IP on Ethernet is adress translation:  IP
addresses are 32 bit (with some internal structure) while Ethernet II
adresses are 48 bits (all but one bit have no special significance).
	As far as which services must or should be implemented, the
definitive answers are in the RFC series documenting the protocols, but all
you "have to" implement are the IP transport layer (including honoring
certain supervisory messages such as "use gateway X to net Y") and
realistically TCP and UDP protocols.  User and server functions need only be
implemented for services you use.  99% of needs can likely be met with
TELNET (virtual terminal), FTP (file transfer) and SMTP mail.  A nominally
single-user workstation needs TELNET user, both FTP server and user, and
maybe SMTP (unless you do all mail on a large host you TELNET to).

-- 
Darrel J. Van Buer, PhD
System Development Corp.
2500 Colorado Ave
Santa Monica, CA 90406
(213)820-4111 x5449
...{allegra,burdvax,cbosgd,hplabs,ihnp4,sdccsu3,trw-unix}!sdcrdcf!darrelj
VANBUER@USC-ECL.ARPA