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Docs: historical (ish) text about Telnet and Rlogin.

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SUPDUP came, at my insistence, with a history section in the docs
for people who hadn't heard of it. It seems only fair that the
other obsolete network protocols (or, at least, the ones we *wish*
were obsolete :-) should have the same kind of treatment.
This commit is contained in:
Simon Tatham 2021-04-17 13:23:57 +01:00
parent 026194eab1
commit ab7bfdda5b
2 changed files with 38 additions and 4 deletions
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4
doc/config.but
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@ -37,6 +37,10 @@ Rlogin, and SUPDUP.
\b See \k{using-rawprot} for an explanation of \q{raw}
connections.
\b See \k{using-telnet} for a little information about Telnet.
\b See \k{using-rlogin} for information about using Rlogin.
\b See \k{using-supdup} for information about using SUPDUP.
\b The \q{Bare ssh-connection} option in the \q{Connection type} box

38
doc/using.but
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@ -582,12 +582,42 @@ protocol}\q{Raw}, from the \q{Protocol} buttons in the \q{Session}
configuration panel. (See \k{config-hostname}.) You can then enter a
host name and a port number, and make the connection.
\H{using-telnet} Connecting using the \i{Telnet} protocol
PuTTY can use the Telnet protocol to connect to a server.
Telnet was perhaps the most popular remote login protocol before SSH
was introduced. It was general enough to be used by multiple server
operating systems (Unix and VMS in particular), and supported many
optional protocol extensions providing extra support for particular
server features.
Unlike SSH, Telnet runs over an unsecured network connection, so it is
a very bad idea to use it over the hostile Internet (though it is
still used to some extent as of 2020).
\H{using-rlogin} Connecting using the \i{Rlogin} protocol
PuTTY can use the Rlogin protocol to connect to a server.
Rlogin was similar to Telnet in concept, but more focused on
connections between Unix machines. It supported a feature for
passwordless login, based on use of \q{privileged ports} (ports with
numbers below 1024, which Unix traditionally does not allow users
other than \cw{root} to allocate). Ultimately, based on the server
trusting that the client's IP address was owned by the Unix machine it
claimed to be, and that that machine would guard its privileged ports
appropriately.
Like Telnet, Rlogin runs over an unsecured network connection.
\H{using-supdup} Connecting using the \i{SUPDUP} protocol
PuTTY can use the SUPDUP protocol to connect to a server. SUPDUP is a
login protocol used mainly by PDP-10 and Lisp machines during the
period 1975-1990. Like Telnet and Rlogin, it is unsecured, so modern
systems almost never support it.
PuTTY can use the SUPDUP protocol to connect to a server.
SUPDUP is a login protocol used mainly by PDP-10 and Lisp machines
during the period 1975-1990. Like Telnet and Rlogin, it is unsecured,
so modern systems almost never support it.
To make a connection of this type, select \q{SUPDUP} from the
\q{Connection type} radio buttons on the \q{Session} panel (see