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 freeb
sd.
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", mean
ing 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 mu
st be full duplex, without a way to change that.
>
> So, very similar problem with the telnet vs raw connection mismatch, but in t
his case you are not setting the duplex with your
> terminal program. It is being auto-negotiated (or attempting to be) by 'telne
t' on one side or the other.
>
> If you are connecting to a telnetd, you should use a telnet client. If you ar
e 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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