Subj : openbsd telnet to serial
To   : phigan
From : bbsing
Date : Tue Dec 02 2025 17:11:16

  Re: openbsd telnet to serial
  By: phigan to bbsing on Tue Dec 02 2025 03:50:03

Hi phigan,

 >
 > Well no, you'd tell the software using telnetd to use the serial port instead.

I'm still trying to see if this is possible. All my research on today's internet says no.
I'm seeing stuff like socat or some strange bridge like that for linux not freebsd.

There is some vauge stuff about gettytab modifications for modems.
All the documentation is terse for some parts.

 >
 >  > terminal, or the terminal emulation software, from "half duplex" or "local echo" to "full duplex."
 >
 > The half/full duplex thing is unrelated. Yes, you can set "half duplex", meaning the other end won't send stuff back to you so
 > you
 > need your local terminal to "echo" the characters you type for you. Or "full duplex" where the stuff you send out gets sent
 > back,
 > so you don't need your terminal to do it. Most (if not all, now) connections you make will be full duplex, so if you have your
 > terminal set at "half" (aka "local echo on"), you will see double characters... the ones echoed locally by your terminal as well
 > as
 > the ones sent back from the other side. When typing your password, the other side doesn't send back characters, but you will
 > still
 > see the locally echoed characters if you are in half duplex.

Thank you for this information. In a world that is perdominantly full duplex. In the old days using modems often times the local  echo wasn't on, and I couldn't see what I typed with out setting echo to on. A telnet connection via client must be full duplex, without a way to change that.
 >
 > So, very similar problem with the telnet vs raw connection mismatch, but in this case you are not setting the duplex with your
 > terminal program. It is being auto-negotiated (or attempting to be) by 'telnet' on one side or the other.
 >
 > If you are connecting to a telnetd, you should use a telnet client. If you are connecting to getty or something else answering
 > the
 > connection and just passing it along to 'login' or what-have-you, you should make a raw connection (like with netcat or a BBSing
 > terminal program).
 >

Great info here, thank you. Thanks to everyone who responded to these posts.

Thanks phigan.

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