Nп/п : 97 из 100
От : Wilfred van Velzen 2:280/464 02 май 25 17:38:51
К : Tommi Koivula 02 май 25 18:47:01
Тема : Re: Weekly nodelist report on noteworthy changes (108)
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Hi Tommi,
On 2025-05-02 17:52:18, you wrote to me:
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. ;-)
TK> You were lucky this time, you were using telnet to connect
vmodem, but it was
TK> telnet server indeed. ;)
See below.
WV>> What is IVM anyway? There are only a few minimal mentions of it in
WV>> the 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
TK> From the SIO v1.60 docs:
TK> === Cut ===
TK> WHAT IS VMODEM
TK> Vmodem is a software implementation of a modem, referred to as a
TK> Virtual Modem. Basically, it attempts to fake out other software
TK> (like terminal programs) into believing they are accessing a real
TK> modem. Vmodem will turn any Terminal into a Telnet Client, and any
TK> BBS into a Telnet Server.
TK> Normal (real) modems provide an interface that allows terminal
TK> programs to pass digital information across telephone lines. Vmodem
TK> does the same thing from the application (terminal) program`s point of
TK> view. However, the other side of Vmodem is not a phone line, but a
TK> digital network like Internet. Thus, Vmodem allows the hoards of
TK> communications programs to pass information across Internet instead of
TK> using phone lines.
TK> In addition to acting as a Telnet server, Vmodem uses a newly designed
TK> protocol for communications networks, called the Virtual Modem
TK> Protocol (VMP). At this time, no other programs have implemented VMP,
TK> thus Vmodem is required on both ends of the connection to use the VMP.
TK> However, VMODEM.EXE will accept inbound Telnet connections from any
TK> system, meaning a BBS under vmodem can be accessed by just about
TK> anyone with an Internet connection.
TK> Future implementations of Vmodem may access networks other than
TK> Internet and use TCP/IP implementations other than IBM`s. The current
TK> implementation of Vmodem works only on Internet, using the Internet
TK> Access Kit (IAK) that is included with OS/2 V3 and IBM`s TCP/IP (for
TK> OS/2) version 2.0, with the August 1994 CSD applied.
TK> A single invocation of Vmodem can service all of the Internet ports
TK> defined in the SIO command line.
TK> === Cut ===
If I read that correctly IVM is just an extension of ITN with
VMP. So IVM implies ITN by default.
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" ?
TK> Yes. SIO/VModem can accept telnet and vmodem calls. By default ports ITN:23
TK> and IVM:3141.
So I wasn`t lucky my simple telnet test worked... ;-)
Bye, Wilfred.
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