/etc/ser2net.conf is in ser2net 2.9.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This is the configuration file for ser2net. It has the following format:
# <TCP port>:<state>:<timeout>:<device>:<options>
# TCP port
# Name or number of the TCP/IP port to accept con-
# nections from for this device. A port number may
# be of the form [host,]port, such as 127.0.0.1,2000
# or localhost,2000. If this is specified, it will
# only bind to the IP address specified. Otherwise
# it will bind to all the ports on the machine.
#
# state Either raw or rawlp or telnet or off. off disables
# the port from accepting connections. It can be
# turned on later from the control port. raw enables
# the port and transfers all data as-is between the
# port and the long. rawlp enables the port and
# transfers all input data to device, device is open
# without any termios setting. It allow to use
# /dev/lpX devices and printers connected to them.
# telnet enables the port and runs the telnet proto-
# col on the port to set up telnet parameters. This
# is most useful for using telnet.
#
# timeout
# The time (in seconds) before the port will be dis-
# connected if there is no activity on it. A zero
# value disables this funciton.
#
# device The name of the device to connect to. This
# must be in the form of /dev/<device>.
#
# options
# Sets operational parameters for the serial port.
# Options 300, 1200, 2400, 4800, 9600, 19200, 38400,
# 57600, 115200 set the various baud rates. EVEN,
# ODD, NONE set the parity. 1STOPBIT, 2STOPBITS set
# the number of stop bits. 7DATABITS, 8DATABITS set
# the number of data bits. [-]XONXOFF turns on (-
# off) XON/XOFF support. [-]RTSCTS turns on (- off)
# hardware flow control, [-]LOCAL turns off (- on)
# monitoring of the modem lines, and
# [-]HANGUP_WHEN_DONE turns on (- off) lowering the
# modem control lines when the connextion is done.
# NOBREAK disables automatic setting of the break
# setting of the serial port.
# The "remctl" option allow remote control (ala RFC
# 2217) of serial-port configuration. A banner name
# may also be specified, that banner will be printed
# for the line. If no banner is given, then no
# banner is printed.
#
# or...
# BANNER:<banner name>:banner
# This will create a banner, if the banner name is given in the
# options of a line, that banner will be printed. This takes the
# standard "C" \x characters (\r is carraige return, \n is newline,
# etc.). It also accepts \d, which prints the device name, \p,
# which prints the TCP port number, and \s which prints the serial
# parameters (eg 9600N81). Banners can span lines if the last
# character on a line is '\'. Note that you *must* use \r\n to
# start a new line.
#
# Note that the same device can be listed multiple times under different
# ports, this allows the same serial port to have both telnet and raw
# protocols.
# The original config file shipped with the upstream sources can be
# found in /usr/share/doc/ser2net/examples
BANNER:banner:\r\nser2net port \p device \d [\s] (Debian GNU/Linux)\r\n\r\n
2000:telnet:600:/dev/ttyS0:9600 8DATABITS NONE 1STOPBIT banner
2001:telnet:600:/dev/ttyS1:9600 8DATABITS NONE 1STOPBIT banner
3000:telnet:600:/dev/ttyS0:19200 8DATABITS NONE 1STOPBIT banner
3001:telnet:600:/dev/ttyS1:19200 8DATABITS NONE 1STOPBIT banner
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