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From: jbvb@FTP.COM (James B. Van Bokkelen)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: tcp source port number assignment in new tcp connection
Message-ID: <9009061442.AA28405@ftp.com>
Date: 6 Sep 90 14:42:05 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: jbvb@ftp.com
Organization: The Internet
Lines: 10

If you start at 1024, you won't fall afoul of the machines that
believe that reserved ports end there, instead of at 1000.  Some
systems expect all connections for particular protocols to use source
ports between 600 and 1024, but other protocols are required to
originate from ports numbered above 1024.  If you're actively opening
an FTP data connection from a server, you'll find that there are
machines that insist the originating port be 20.  Otherwise, fine.

James B. VanBokkelen		26 Princess St., Wakefield, MA  01880
FTP Software Inc.		voice: (617) 246-0900  fax: (617) 246-0901