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DTCPCLIENT(8)		  BSD System Manager's Manual		 DTCPCLIENT(8)

NAME
     dtcpclient — Dynamic Tunnel Configuration Protocol client

SYNOPSIS
     dtcpclient [-b udp-port] [-B nat-port] [-d] [-D] [-f pidfile] [-l]
		[-m mtu] [-n] [-p port] [-s script] [-t tuntype] [-u user]
		[-U] server

DESCRIPTION
     dtcpclient implements Dynamic Tunnel Configuration Protocol (DTCP for
     short) proposed by Trumpet.  dtcpclient will first ask the DTCP password
     to the user.  Then, the program will try to connect DTCP server via IPv4
     TCP, login as DTCP client, and maintain IPv6 over IPv4 tunnel connection.

     The following options are available:

     -b port
	     Sets the port number to bind on local for an UDP tunnel to port.
	     The default is “4028”.

     -B port
	     If you are behind NAT which is statically configured to forward
	     the UDP tunnel traffic arrived to the specific port, sets the
	     port number to port.  This option is meaningful only with -U
	     option, and is usually used with -n.  The default is not defined.

     -D	     dtcpclient becomes daemon.

     -d	     Put dtcpclient to debug mode.

     -f file
	     If dtcpclient is invoked as daemon, the process ID of the
	     dtcpclient are held in /var/run/dtcpclient.pid by default.	 You
	     may want to change the file name.

     -l	     By default, when connection to the server is closed, dtcpclient
	     will exit.	 When this option is specified, dtcpclient doesn't
	     exit on connection close, and continuously tries to re-connect.

     -m mtu  Sets the MTU of the tunnel to mtu.	 The default is “1280”.

     -n	     By default, dtcpclient checks if the IPv4 address which DTCP
	     server recognized is equal to the actuall IPv4 address of your
	     box.  This check can be ommitted by specifying this option.  It
	     may save the user lives behind NAT that maps private IPv4 address
	     to global IPv4 address.

     -p port
	     Sets the port number to port.  The default is “20200”.

     -s script
	     Specify the command to invoke on DTCP session is established or
	     closed.  The default is /usr/local/etc/dtcpclient.script.

     -t tuntype
	     The spec defines several kind of tunnel requests.	dtcpclient
	     will request tunnel typed tuntype to the DTCP server.
	     “tunnelonly”, “host” and “network” are available for tuntype.
	     The default value is “tunnelonly”.

     -u user
	     Specifies the user.  It is needed when DTCP user account is dif‐
	     ferent from the login name on the host.

     -U	     By default, dtcpclient creates a generic tunnel.  If this option
	     is set, dtcpclient creates an IPv6 over an UDP/IPv4 tunnel
	     instead.  An IPv6 over an UDP/IPv4 tunnel requires Netgraph.
	     (Experimental)

     server  DTCP server which dtcpclient try to connect.

     Upon receipt of signal SIGHUP, dtcpclient will try to reconnect to the
     DTCP server.

RETURN VALUES
     dtcpclient will exit with positive value on errors.

PARAMETERS PASSED TO SCRIPTS
     The invoked scripts get passed these parameters:

     state	  Why this script is called.  Possible state are “up” and
		  “down”.

     server	  DTCP server which dtcpclient connect to.

     myaddr	  My actuall IPv4 address.

     tuntype	  The tunnel type.  The value is one of “tunnelonly”, “host”
		  or “network”

     me		  My IPv4 address which DTCP server recognize.

     her	  The destination IPv4 address of the tunnel.

     me6	  The IPv6 address for local tunnel end point if this is a
		  “host” tunnel type or numbered tunnel when tunnel type is
		  “network”.

     her6	  The IPv6 address for remote tunnel end point if this is a
		  “host” tunnel type or numbered tunnel when tunnel type is
		  “network”.

     prefix	  The IPv6 prefix assigned to local network when this is a
		  “network” tunnel type .

FILES
     /usr/local/etc/dtcpclient.auth
	       You can specify your password to connect to DTCP server in this
	       file.  If your password is found in this file, dtcpclient does
	       not ask for your password.  The format is a colon-separated
	       list of the server name, the user name and the password.
     /usr/local/etc/dtcpclient.script
	       Default script invoked for setup or cleanup tunnel when DTCP
	       session is established or closed.
     /var/run/dtcpclient.pid
	       Contains the process ID of the dtcpclient listening for connec‐
	       tions. The content of this file is not sensitive; it can be
	       world-readable.	This file name may be changed by -f option.

SEE ALSO
     dtcps(8)

AUTHOR
     Hajimu UMEMOTO ⟨ume@mahoroba.org⟩.

BUGS
     dtcpclient will not work if you are behind a NAT box (This is a protocol
     feature, not a bug).  -n may help you on such case.  But, it is still
     depend on the behavior of your NAT box.

BSD				 May 25, 2006				   BSD

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