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Management Teamviewer © Thor Jorgen Udvang, 123RF.com Convenient graphical remote control Remotely Controlled Teamviewer is an impressive demonstration of how easy remote control across routers and firewalls can be. The popular software is now available for Linux. By Daniel Kottmair Some 60 million users already have the Teamviewer [1] commercial remote control solution running on Windows and Mac OS X. Because of the many requests from customers, Teamviewer’s manufacturer now provides a variant for Linux in version 5. Teamviewer facilitates remote access to other computers across a network. The only requirement is that the machine at the other end is also running Teamviewer. Teamviewer provides all this functionality in a standalone program; special client or server versions are not available. Teamviewer automatically generates a globally unique ID on each machine. When it is launched, Teamviewer generates a new password that the computer on the opposite end of the connection can use to access the local machine. This scheme prevents anybody who has ever logged in to that machine from doing so again without the owner’s authorization. You can keep the newly generated password or define one yourself. Connections Remote access without port forwarding works across routers and firewalls thanks to one of the globally distributed Teamviewer servers on the web, which initiates a 256-bit encrypted UDP connection between the two parties. If a proxy server or a firewall with content filtering makes this connection impossible, the transfer is handled directly by the Teamviewer server. The HTTP label in the window header, rather than the UDP label, identifies this kind of connection. If you are worried about using a thirdparty server, Teamviewer will sell you your own authentication server on request. Teamviewer will even let you remotely control computers that only have a modem connection. The software vendor improved compression in version 5 to reduce the amount of data crossing the wire. Video, Flash banners, and other applications that permanently change screen content are problematic, but a fast DSL connection will let even those types of applications run at an acceptable speed. Private users can run the program free of charge, and the vendor offers commercial licenses for commercial use. Teamviewer is available for Windows, Mac OS X, and Linux; any platform can remotely control any other platform. An iPhone client, available after registering for free online, lets you remotely control a computer as well. The web and iPhone clients are the only versions that can only control, rather than work in both directions. The other variants let you control 64 Admin 01 www.admin-magazine.com
Teamviewer Management and be controlled, and you can even change directions mid-flow. Linux Specifics Teamviewer offers downloads of deb and RPM versions 5.0.8206 packages for Linux, along with an X64 deb package and a simple tarball that you don’t even need to install. Teamviewer for Linux is still beta, and the vendor asks for feedback and bug reports. The program is based on a modified version of Wine, although the vendor has made some Linux-specific changes (e.g., to accelerate reading of X server graphics). Although it uses Wine, it is not just a copy of the Windows version. A native Linux version is not available right now, but the vendor is considering creating one depending on acceptance and popularity of the Wine-based version. The program offers a plethora of built-in remote control solutions, such as the ability to change direction, reboot, simulate a Ctrl+Alt+Del key press, and transfer files conveniently between two machines. Multiple logins on a single machine are also supported (e.g., for training purposes in which you need to demonstrate something to a group of users). The VoIP and video chat function introduced in version 5 is also useful, and the application relies on free codecs: Speex for audio and Theora for video. Video on Linux only works in the receiving direction right now. V4L-connected Linux webcams are not currently supported by Teamviewer. The Linux version has a couple of other restrictions: The whiteboard function, which lets users draw on a whiteboard at the same time, and VPN support both fail to provide the goods. The program does not transmit virtual consoles, so you need an X server. The reboot, Ctrl+Alt+Delete key sequence, and Disable Input/ Display on remote computer functions all require the remote machine to run Windows – Mac users have a similar problem. And, the same thing applies to changing the resolution and remov- Figure 1: The Teamviewer window at program launch. a connection between a v4 Mac client and a v5 Linux client worked without problems. The program offers three operating modes when it launches (Figure 1): Remote support, Presentation, and File transfer. Remote support lets you remotely control a system, and presentation mode lets you demonstrate an action to one or multiple users on their own machines. File transfer leaves out the administrative and graphic functions and simply sends files to, or retrieves them from, a remote machine. This mode is acing the wallpaper (to avoid unnecessary data traffic). In the Lab The Linux version works fairly well despite its beta status. One thing that always worked during testing – no matter what network the computers used or what firewalls they were hiding behind – was the connection setup. Teamviewer has thus mastered the most important discipline in remote control with flying colors. Also, no version problems emerged; Figure 2: File transfers between computers are convenient and easy to keep track of. www.admin-magazine.com Admin 01 65
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