Subj : Weekly nodelist report on noteworthy changes (108)
To   : Wilfred van Velzen
From : Tommi Koivula
Date : Fri May 02 2025 17:52:18


02 May 25 14:18, Wilfred van Velzen wrote to Tommi Koivula:

 WvV>>>> 2:420/333 also got an updated IVM flag, but there is a timeout
 WvV>>>> when trying to connect to the advertised port.
 WV>>>
 WV>>> Another IVM update for this node, and there is now a connect and
 WV>>> an EMSI response.
 WV>
 TK>> How did you test? That's not IVM in port 2030, it's ITN.
 WV>
 WV> I'm not testing the protocol. I just connect to the advertised port
 WV> with telnet, and report on what I see. ;-)

You were lucky this time, you were using telnet to connect vmodem, but it was telnet server indeed. ;)

 WV> What is IVM anyway? There are only a few minimal mentions of it in the
 WV> FTSC docs:
 WV>
 WV>
 WV> FRL-1016:
 WV>
 WV> 1.1.8.4.  IVM[:3141]
 WV>           Vmodem protocol according to Ray Gwinn's SIO-package
 WV>           for OS/2

From the SIO v1.60 docs:

=== Cut ===

                                 WHAT IS VMODEM

     Vmodem is a software implementation of a modem, referred to as a
     Virtual Modem.  Basically, it attempts to fake out other software
     (like terminal programs) into believing they are accessing a real
     modem.  Vmodem will turn any Terminal into a Telnet Client, and any
     BBS into a Telnet Server.

     Normal (real) modems provide an interface that allows terminal
     programs to pass digital information across telephone lines.  Vmodem
     does the same thing from the application (terminal) program's point of
     view.  However, the other side of Vmodem is not a phone line, but a
     digital network like Internet.  Thus, Vmodem allows the hoards of
     communications programs to pass information across Internet instead of
     using phone lines.

     In addition to acting as a Telnet server, Vmodem uses a newly designed
     protocol for communications networks, called the Virtual Modem
     Protocol (VMP).  At this time, no other programs have implemented VMP,
     thus Vmodem is required on both ends of the connection to use the VMP.
      However, VMODEM.EXE will accept inbound Telnet connections from any
     system, meaning a BBS under vmodem can be accessed by just about
     anyone with an Internet connection.

     Future implementations of Vmodem may access networks other than
     Internet and use TCP/IP implementations other than IBM's.  The current
     implementation of Vmodem works only on Internet, using the Internet
     Access Kit (IAK) that is included with OS/2 V3 and IBM's TCP/IP (for
     OS/2) version 2.0, with the August 1994 CSD applied.

     A single invocation of Vmodem can service all of the Internet ports
     defined in the SIO command line.

=== Cut ===

 WV>
 WV> FTS-5001:
 WV>
 WV>    IVM     3141  Vmodem connection using FTS-1 or any other protocol
 WV>                  designed for classic POTS and modem.
 WV>
 WV>
 WV> Wouldn't the node qualify for IVM under the FTS-5001 "definition" ?

Yes. SIO/VModem can accept telnet and vmodem calls. By default ports ITN:23 and IVM:3141.

'Tommi

--- FastEcho/2 1.46.1 Revival
 * Origin: =========================>>>> (2:221/1.254)

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