Dave Baxter wrote: > Mind you, how would you handle simultaneous connections to one port > anyway... At present, I don't think it's possible without > alterations > to everyone's TCP/IP stack? Unless someone knows better.
No problem, the client establishes a second connection to Port 21 and tells the server to treat this second connection as the data connection. -- Arno Garrels > > As above, what's wrong with Passive (or PASIV) mode? > > Cheers. > > Dave B > >> -----Original Message----- >> From: Angus Robertson - Magenta Systems Ltd >> [mailto:[EMAIL PROTECTED] >> Sent: 16 September 2008 18:11 >> To: twsocket@elists.org >> Subject: [twsocket] Single port FTP >> >> We all know of the problems caused by the FTP data connection >> with NAT routers, firewalls, etc, so it's interesting someone >> has come up with an RFC proposal that allows the data >> connection to also run on port 21. >> >> http://www.ietf.org/internet-drafts/draft-rosenau-ftp-single-p >> ort-04.txt >> >> Essentially, a second connection is opened to port 21, with a >> simple logon process to tie it to the initial 21 connection, >> then the real data sent after a 200 DATA response. >> >> - The control connection ("--1-->") is established. >> S--1-->C 220 FTP server ready<CRLF> >> C--1-->S USER u001<CRLF> >> S--1-->C 331 Enter password<CRLF> >> C--1-->S PASS xyz<CRLF> >> S--1-->C 230 You are logged in<CRLF> >> C--1-->S SPSV<CRLF> >> S--1-->C 227 Entering single-port mode (xYab1234)<CRLF> >> - The data connection ("---2->") is established >> S---2->C 220 FTP server ready<CRLF> >> C---2->S SPDT xYab1234<CRLF> >> S---2->C 200 DATA<CRLF> >> C--1-->S RETR contents.txt<CRLF> >> S--1-->C 150 Transmitting data<CRLF> >> S---2->C (Contents of contents.txt) >> - The server closes the data connection ("---2->") >> S--1-->C 226 Data transferred<CRLF> >> ... >> >> Angus >> >> >> > This mail has been scanned by Palmer Cook Computer Services Limited. > www.palmercook.co.uk -- To unsubscribe or change your settings for TWSocket mailing list please goto http://lists.elists.org/cgi-bin/mailman/listinfo/twsocket Visit our website at http://www.overbyte.be
