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forward(1)							    forward(1)

NAME
       forward - arbitrary socket forwarding over a secure or compressed chan‐
       nel

SYNOPSIS
       forward
       [-h, --help]
       [-v, --verbose]
       [-V, --version]
       [-p, --password password]
       [--netrc]
       [--no-netrc]
       [--secure]
       [-z, --gzip]
       [-K, --key-size bits]
       [user@]machine1[:port1]
       machine2:port2
       listen_port

DESCRIPTION
       forward listens on port listen_port on  your  local  machine.  When  it
       receives	 a  connection,	 it  forwards this to machine1 where a secure-
       mcserv(1) daemon is assumed to be  running.  The	 secure-mcserv	daemon
       then  makes a connection to machine2 on port port2. All traffic is then
       forwarded transparently between listen_port and port2 of machine2.

       The --secure and --gzip options can be used to  effect  the  connection
       between listen_port of the local machine and port2 of machine2. In this
       way forward can be used to create secure or compressed versions of  any
       service.

OPTIONS
       All  options  are analogous to those of mirrordir. See mirrordir(1) for
       more info. --debug just prevents forward from forking  into  the	 back‐
       ground as a daemon.

EXAMPLES
       I  havn't  tested  this,	 but they seem logical. Tell me if I've made a
       typo somewhere.

       Consider a print server A on some  LAN.	The  LAN  has  a  masquerading
       server  B  giving that LAN internet access. B can see both the internet
       and A. At some other site John has a machine  D	using  a  masquerading
       server  C  to give that LAN internet access. B and C can see each other
       only over the open internet. He would like to run lpr on D and have  it
       automatically  print out at A. He would also like the channel between B
       and C to be compressed and encrypted (using a 1024 bit key exchange).

       The procedure is as follows (515 is the printer port):
	   A# lpd &
	   B# secure-mcserv -d -p 12345
       add an entry to ~/.netrc for the password of john on B, then
	   C# forward john@B:12345 A:515 515 --secure -K 1024 -z
       add an entry to /etc/printcap, defining a printer x on C, then
	   D# lpr -Px mydocument

       Consider Jill who doesn't like colleague John printing out screen dumps
       of  her	X session. She would like to create a secure X session between
       her X server A and her mainframe B.

       The procedure is as follows (6010 corresponds to display 10.0):
	   A# X &
	   A# secure-mcserv -d -p 12345
       add an entry to ~/.netrc for the password of jill on A, then
	   B# forward jill@A:12345 A:6000 6010 --secure -K 1024
	   B# export DISPLAY=localhost:10.0
	   B# fvwm &

LIST OF TESTED SERVICES
       Telnet logins, X sessions, printer (lpr) services, http and  pop3  con‐
       nections	 have  been  tested  and  work. Ftp connections do not forward
       because of the way ftp tries to do wierd binding	 things	 with  sockets
       (?).  Please  tell  about  what	else  worked, although most everything
       should work.

BUGS
       See also the BUGS section of mirrordir(1).

       Out of bounds (MSG_OOB of recv(2) and send(2)) data is never  encrypted
       or  compressed.	It  is	sent  unmodified in the plain text.  If anyone
       thinks this is a security risk, please tell me about it and  I'll  come
       up with something.

       Screen  resizing	 (detection?)  under  rlogin(1) does not seem to work,
       although it works under telnet(1). This must have something to do  with
       OOB  data  not being sent properly. I don't feel like debugging rlogin,
       rlogind, forward, and secure-mcserv simultaneously to find the problem.
       If anyone wants to try this please go ahead.

FILES
       ~/.netrc
	      List of machines and corresponding passwords.

STANDARDS
       mirrordir  is  an  invention  of	 its author and does not belong to any
       operating system standard.

AVAILABILITY
       The latest version of the program can be found  at  either  ftp://meta‐
       lab.unc.edu/pub/Linux/system/backup,	   or	     ftp://lava.obsid‐
       ian.co.za/pub/linux/mirrordir.

AUTHOR
       Paul Sheer  <psheer@obsidian.co.za>  <psheer@icon.co.za>

SEE ALSO
       mirrordir(1), pslogin(1), ssh(1)

Linux			       1999 February 14			    forward(1)
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