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Scannex ip.buffer User Manual
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11.8. Legacy Emulation (TCP Server)
The legacy emulation option provides the ip.buffer with the ability to behave like legacy
command-line driven buffers.
This option is not visible unless a suitable Emulation Lua script has already
been loaded into the buffer, and the Lua core has been rebooted.
TCP Port
The TCP/IP port to listen on. This port must be a unique number
within the ip.buffer (i.e. you cannot have two channels
listening on the same port number).
Most legacy devices will use port 23.
[6001]
Interface
“LAN only” – allows incoming connections only from Ethernet.
“Modem only (PPP)” – allows incoming connections only from
PPP. Ethernet will not connect. Modem dial-ins must use
PPP only.
“LAN, Modem (PPP & Legacy)” – Allows Ethernet, dial-in PPP
connection, and legacy-style “dumb” modem dial-in
connections.
[LAN, Modem (PPP & Legacy)]
Allow
You can enter a single name or IP address to restrict access to the
TCP server on the LAN25. Any non-matching clients will
have their connection closed before any data is sent.
(Hint: leave this blank until you have the system working, and
then secure it with a value)
If you want to restrict connections to just “dumb” legacy modem
dial-in, then set this to “127.0.0.1”
[blank]
TLS/SSL
“No encryption” – a plain TCP/IP session. Most legacy devices
will not use TLS/SSL for their socket connections.
“Implicit (by port)” – starts with an SSL/TLS connection. A
client that connects with plain TCP/IP will time out and
be disconnected26.
[No encryption]
Client Type
“Auto” – if the client software negotiates Telnet options then we
send back further Telnet options.
“Telnet” – The ip.buffer sends Telnet options when the client
connects. This is necessary when a Linux telnet command
is used to connect to a non-standard port.
“Raw TCP/IP” – No Telnet options. Every byte is transferred
without modification between source and pass-through.
[Telnet]
25
When dialling in with a modem the “Allow” address is ignored.
26
The “dumb” legacy modem dial-in mode will only work if “No encryption” is chosen.
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