LBX, FreeNX, NoMachine's NX and TightVNC

LBX, FreeNX, NoMachine's NX: faster, significantly faster still, amazing, respectively. The latter is easy to install and configure too.



 -- on server (remote system):  apt-get install tightvncserver
 -- on client (local system) :  apt-get install xtightvncviewer

 -- read the man pages!  
     -- e.g,
            xtightvncviewer -encodings tight <remote>
            xtightvncviewer -encodings tight -compresslevel 9 <remote>
            xtightvncviewer -encodings tight -quality 0 <remote>

            xtightvncviewer -encodings zlib <remote>


LBX (Low Bandwidth X) is an X server extension which performs 
compression on the X protocol.  It is meant to be used in 
conjunction with X applications and an X server which are 
separated by a slow network connection, to improve display 
and response time.

dxpc - The Differential X Protocol Compressor

    * Original Author: Brian Pane <>
    * Current Maintainer: Zachary Vonler <>

dxpc works in essentially the same way as LBX.  However, to avoid 
having to implement an X extension and modify the X server code, 
dxpc uses two proxies: one that runs on the REMOTE host, like 
lbxproxy, and one that runs on the LOCAL host.

Date: Fri, 26 Nov 2004 22:10:17 +0000
From: Gavin Hamill <>

Yes. Think about using vncserver instead of trying to squeeze the
inherently verbose X format over a serial link... there are a couple of
different approaches here - one acts like MS Terminal Services where you
log onto a 'virtual desktop' that is unseen on any physical display,
(vncserver itself) and the other involves watching the current desktop
via VNC (usually using a user-space wedge like 'x11vnc')

However, a recent way to do this is using an X extension '' so you
can immediately plug straight in and see the desktop and interact with
the live session - I use this daily for remote support on a network of
30 Linux boxes :)

Date: Sat, 27 Nov 2004 01:04:49 +0000
From: Ben Higginbottom <>
User-Agent: Mozilla Thunderbird 0.9 (Windows/20041103)

In addition to vnc, take a look at NX ( or
freenx ( both of which compress X for network
computing and I've found them to be much superior in performance terms
in regards to vnc.

NoMachineNX and FreeNX

NoMachine vs Free

In my experience, as of 2006 Oct 01, having tried both over the last couple of years(?), the NoMachine version, which is now free-forever for Linux is easier to install, less buggy and faster. But a big thankyou to the FreeNX guys whose product I used for 2 years.


Simply download the packages for nclient, nxnode and nxserver, and install in that order.

Installation: Free NX


  dpkg -i nxproxy_1.4.0-m2-1_i386.deb nxagent_1.4.0-m2-1_i386.deb freenx_0.3.1-2_all.deb

      -- simple: choose built in key from nomachine
      -- better: choose custom key

  nxsetup --install

  OLD:  nxserver --adduser ...
                 --passwd  ...

          ... this adds a key to /home/<user>/.ssh/authorized_keys and adds usernames and passwords into its own 
              db which is now pointless as PAM is used...


  dpkg -i nxclient_1.5.0-141_i386.deb

 -- simple:
        client: nxclient... should authenticate via built in key (with pam username and password???)

 -- better:  copy server:/var/lib/nxserver/home/.ssh/client.id_dsa.key to the client

    OLD:  on client mv this key to /usr/NX/share and chmod 644
    NOW:  import key into client and authenticate with pam credentials..