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Re: Telnet and FTP to Historic

Keith Moore <moore@network-heretics.com> Thu, 03 December 2020 17:25 UTC

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Subject: Re: Telnet and FTP to Historic
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From: Keith Moore <moore@network-heretics.com>
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Date: Thu, 03 Dec 2020 12:25:34 -0500
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On 12/3/20 6:47 AM, Dave Cridland wrote:

>
> A conformant TELNET client implementation can (and maybe even will) 
> send IAC commands over the link, which will confuse HTTP and SMTP, and 
> quite possibly mildly surprise non-conformant FTP.
>
> I'd suggest you use `nc` instead of `telnet` to avoid this risk.

nc works of course, but every telnet client I know of disables option 
negotiation if you specify a port number other than 23.

Keith

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