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Recent content - 1 new post
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1. VNC (Virtual Network Computing )
Published Blog entry by Raul Suarez
[ http://kwlug.org/node/712 ]

Up to now the graphical solutions I've shown were focused on accessing
the X desktop. I've also focused on accessing a session exclusively.
On this post I will talk about a tool that is OS independent. You can
share a Mac or Windows or Linux desktop and that allows remote
collaboration with multiple people looking and controlling the same
desktop.

VNC uses the RFB protocol to transmit keyboard and mouse signals to
remote computer and receive back the graphical screen.
Most implementations under Linux allow sharing a secondary session but
a few allow sharing the main desktop.
My preferred one which is distribution and desktop manager independent
is x11vnc
Connecting through VNC
On the server side:
x11vnc -display :0
On the client side
vncviewer hostaddress:0
Of course you can open additional sessions. This is useful when you
want to have multiple people working on the same computer on different
sessions.
x11vnc -display :1
Sometimes (usually due to port blocking) you need to have the client
waiting for the server to open the connection.
To do the reverse VNC the local computer “listens” and the remote
computer connects
On the local computer
vncviewer -listen
On the remote computer
x11vnc -connect home-desktop
Configuration
When connecting to the main desktop there is no additional
configuration. But when connecting to an additional session you must
specify what kind of session it is.
You do this by modifying the ~/.vnc/xstartup script.
Tunneling VNC over SSH
The VNC protocol opens by default port 5900. 
VNC is not an inherently safe protocol so when connecting to a computer
using VNC over the open Internet it is advisable to do it over an SSH
tunnel [1]
SSH to the remote computer opening the VNC listening port
ssh user at remotecomputer.com -L 5900:localhost:5900
Once connected execute the command on the remote console
sudo x11vnc -display :0
On the local computer open a different console
vncviewer localhost:0
Gnome
Gnome includes a set of VNC server and client that allow sharing the
main desktop
The server is called Vino and is located on the main menu under
Preferences | Remote desktop
There you can enable it and set other connection parameters

The client is called Vinagre and is located under Internet | Remote
desktop viewer
KDE
KDE also includes a set of VNC server and client
The server is called kfrb and is located on the main menu under
Internet | Desktop Sharing
The client is called krdc and is located on the main menu under
Internet | Remote Desktop Client
The KDE client has some nicer features such as scaling and full screen
"on the fly"

[1] http://kwlug.org/node/707


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