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Virtual Network Computing (VNC)

Virtual Network Computing (VNC). Dave Grizzanti Steve Curti. Backround. VNC is remote control software which allows you to view and interact with one computer (the "server") using a simple program (the "viewer") on another computer anywhere on the Internet. Backround.

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Virtual Network Computing (VNC)

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  1. Virtual Network Computing (VNC) Dave Grizzanti Steve Curti

  2. Backround • VNC is remote control software which allows you to view and interact with one computer (the "server") using a simple program (the "viewer") on another computer anywhere on the Internet.

  3. Backround • The two computers don't even have to be the same type, so for example you can use VNC to view an office Linux machine on your Windows PC at home. • VNC is freely and publicly available and is in widespread active use by millions throughout industry, academia and privately.

  4. Backround • VNC differs from other remote display systems in three crucial ways: • It is fully cross-platform. • It is small and simple. The Windows viewer, for example, is about 150K in size and can be run directly from a floppy. • It is free! You can download it, use it, and redistribute it under the terms of the GNUGeneral Public License.

  5. VNC Protocol • The protocol simply allows a server to update the frame buffer displayed on a viewer. Because it works at the frame buffer level it is potentially applicable to all operating systems. • This includes X/Unix, Windows, and Macintosh, but might also include PDAs, and indeed any device with some form of communications link. The protocol will operate over any reliable transport such as TCP/IP.

  6. VNC Protocol • The VNC protocol is a simple protocol for remote access to graphical user interfaces. It is based on the concept of a remote frame buffer or RFB.

  7. VNC Clients • Writing an VNC viewer is a simple task, as it should be for any thin-client system. It requires only a reliable transport (usually TCP/IP), and a way of displaying pixels (either directly writing to the frame buffer, or going through a windowing system). • VNC clients exist for all flavours of Unix, Windows, Macintosh, Java and for smaller hand-held appliances.

  8. VNC Servers • Writing an VNC server is slightly harder than writing a client for a number of reasons. The protocol is designed to make the client as simple as possible, so it is usually up to the server to perform any necessary translations. • For example, the server must provide pixel data in the format the client wants. There are servers Unix, Windows and Macintosh platforms A Unix machine can run a number of Xvnc servers for different users, each of which represents a distinct VNC desktop. • Each VNC desktop is like a virtual X display, with a root window on which several X applications can be displayed.

  9. VNC Servers • The Windows server (WinVNC) is a little more difficult to create, because there are fewer places to insert hooks into the system to monitor display updates, and a less clearly-defined model of multiuser operation. • Servers simply mirrors the real display to a remote client, which means that the server is not 'multiuser'. It does, however, provide the primary user of a PC with remote access to their desktop.

  10. Servers and Viewers • RealVNC http://www.realvnc.com/ • TightVNC http://www.tightvnc.com/ • UltraVNC http://ultravnc.sourceforge.net/ • Chicken of the VNC http://sourceforge.net/projects/cotvnc/ • OSXvnc http://www.redstonesoftware.com/vnc.html

  11. Installation • Windows: • Download a copy of RealVNC. • You can choose between installing the just the viewer or both the server and viewer. • Install the program. • Set password and chosen options.

  12. VNC – Java viewer • An machine running a VNC server can be connected to by any other machine running a web browser and connected to the Internet. • Example

  13. Installation • Linux: • rpm -q vnc vnc-server. • Download latest version from RealVNC (RPM and GZip). • Run RPM and unpackage Gzip into appropriate folder. • Edit files according to http://fedoranews.org/tchung/vnc/index.shtml

  14. Error Log • What went wrong: • TightVNC – Compatibility issues with Fedora, Xwindows. Attempted to install new version of Xwindows. Resulted in failed GUI. • RealVNC – Packages from RealVNC were misleading. Only installed server but not the viewer. Had to download packages for viewer from fedora mirror. http://fedora.officepark.ru/3/i386/os/Fedora/RPMS/?C=N;O=D

  15. Notes • Windows vs. Linux • When logging into Windows machines viewer only requires IP address. • Linux requires IP address plus session number. (i.e. 134.198.161.104:1) • Computer can be logged out (not turned off) but vncserver must be running.

  16. References • http://www.realvnc.com - RealVNC • http://www.tightvnc.com - TightVNC • http://fedoranews.org/tchung/vnc/index.shtml - Fedora News.org

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