inetutils.info: telnetd invocation

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26 'telnetd': Telnet server
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     telnetd [OPTION]...

'-a AUTHMODE'
'--authmode=AUTHMODE'
     Specify what mode to use for authentication.  Allowed values are:
     'none', 'other', 'user', 'valid', and 'off'.

'-D[LIST]'
'--debug=[LIST]'
     Set the debugging level.  The argument is a comma separated list of
     these categories: 'options', 'report', 'netdata', 'ptydata',
     'auth', and 'encr'.  All these may be used in the form
     'name[=level]'.  Omission of 'level' implies the maximal possible
     debugging level for that particular category.

     There is one additional category 'tcp', which does not take an
     additional level indicator, but is instead equivalent to setting
     the socket option 'SO_DEBUG' for debugging the complete traffic.

     The output is written to the file '/tmp/telnet.debug', and any new
     data is incrementally added as time passes.

'-E STRING'
'--exec-login=STRING'
     Set program to be executed instead of '/bin/login'.

'-h'
'--no-hostinfo'
     Do not print host information before login has been completed.

'-l[MODE]'
'--linemode=[MODE]'
     Set line mode.  An empty argument will force line read mode at all
     times.  The only recognised value is otherwise 'nokludge'.

'-n'
'--no-keepalive'
     Disable TCP keep-alives.

'-S PRINCIPAL'
'--server-principal=PRINCIPAL'
     Set principal name for the server, to be used in Kerberos
     authentication.  The value PRINCIPAL can be set to provide full
     specification like 'srv.local@REALM' and 'tnt/localhost@REALM',
     where the first uses the standard prefix 'host/'.  Or PRINCIPAL can
     override default settings in part only, like 'srv.local',
     'tnt/srv.local', or '@REALM'.

'-U'
'--reverse-lookup'
     Refuse connections from addresses that cannot be mapped back into a
     symbolic name.  A client is accepted only if the IP address can be
     resolved as a host name, and the same name is resolvable to
     addresses among which the clients's address is included.

'-X AUTHTYPE'
'--disable-auth-type=AUTHTYPE'
     Disable the use of the given authentication type.  Use this option
     multiple times if more than one type is to be disabled.  Standard
     choices are 'null', 'kerberos_v4', and 'kerberos_v5'.