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09 七室周五例会报告

09 七室周五例会报告. Linux 远程控制软件介绍 汇报人：张睿瑞 导师：肖炳甲研究员 2009-11-27. 主要内容. 几种远程控制软件介绍 PuTTy Xmanager VNC FreeNX 几种远程控制软件比较 遇到的问题. PuTTy- A Free Telnet/SSH Client. 网址： http://www.chiark.greenend.org.uk/~sgtatham/putty/ 简要介绍： Win32 平台的 SSH 客户端（也支持纯文本 telnet ） 优点： Open Source 小巧 444KB

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09 七室周五例会报告

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  1. 09七室周五例会报告 Linux远程控制软件介绍 汇报人：张睿瑞 导师：肖炳甲研究员 2009-11-27

  2. 主要内容 • 几种远程控制软件介绍 • PuTTy • Xmanager • VNC • FreeNX • 几种远程控制软件比较 • 遇到的问题 主要内容

  3. PuTTy-A Free Telnet/SSH Client • 网址：http://www.chiark.greenend.org.uk/~sgtatham/putty/ • 简要介绍： Win32平台的SSH 客户端（也支持纯文本 telnet） • 优点： • Open Source • 小巧 444KB • 缺点： • 无图形界面 几种远程控制软件介绍

  4. PuTTy 几种远程控制软件介绍

  5. Xmanager- 强大而易用的PC X server软件 • 网址： http://www.netsarang.com/ • 简要介绍： It allows you to bring remote UNIX/Linux desktops to your Windows PC seamlessly. • 特性： 支持Xwindows， 即可以远程使用图形桌面 几种远程控制软件介绍

  6. Xmanager Enterprise edition • all-in-one solution Xmanager Enterprise is an all-in-one solution that includes Xmanager 3D, Xshell, Xftp and Xlpd in a single package. Xmanager 3D lets you share 3D (OpenGL) X window applications, and Xshell enables you to manage remote Unix/Linux servers with a secure terminal. Xftp allows you to transfer files between systems easily and securely. In addition, Xlpd offers local printing for remote documents on other systems. 几种远程控制软件介绍

  7. Xshell & Xstart 几种远程控制软件介绍

  8. VNC- Virtual Network Computing Xvnc is the X VNC (Virtual Network Computing) server. It is based on a standard X server, but it has a "virtual" screen rather than a physical one. X applications display themselves on it as if it were a normal X display, but they can only be accessed via a VNC viewer TightVNC is a free remote control software package. With TightVNC, you can see the desktop of a remote machine and control it with your local mouse and keyboard, just like you would do it sitting in the front of that computer. 几种远程控制软件介绍

  9. 使用VNC访问205.1 启动： vncserver :<displaynum> 首次运行需要设置vnc密码 修改密码： nvcpasswd 关闭启动的桌面号 vncserver –kill :<displaynum> 使用浏览器访问vncserver 方法：http://hostname:580<dislpaynum> 几种远程控制软件介绍

  10. ~/.vnc/xstartup设置文件 VNC服务默认使用的是twm图形桌面环境的，可以在VNC的配置文件xstartup中对其进行修改 更改桌面： gnome-session & 或者 startkde & 几种远程控制软件介绍

  11. Kde桌面 几种远程控制软件介绍

  12. NX-Next Generation Remote Display NX is an exciting new technology for remote display. It provides “near local speed” application responsiveness over high latency, low bandwidth links. The core libraries for NX are provided by NoMachine under the GPL. FreeNX is a GPL implementation of the NX Server and NX Client Components. 几种远程控制软件介绍

  13. NX technology NX uses 3 basic methods to achieve its remote desktop and application speed boosting: compression, caching and roundtrip suppression for X11 traffic. 几种远程控制软件介绍

  14. NX technology NX Compression: NoMachine have developed their own compression algorithm for X traffic. This is about 10 times more efficient than generic ZLIB compression, while using only one tenth of ZLIB's CPU cycles. This is the first secret for NoMachine's NX speedup. NX Caching: NoMachine have also developed a very intelligent caching mechanism for X11 traffic. It produces a quite big "hit rate", sparing the transfer of the same data repeatedly, and restricting the transfer of similar data to a "differential transfer" only. This is the second secret for NoMachine's NX speedup. NX Roundtrip Suppression: Before NX there was no known method to suppress X11 roundtrips over remote links reliably and in a robust way. NX can do that by translating X11 traffic at the remote end (occuring from application to nxagent) into NX protocol traffic. This is the third secret for NoMachine's NX speedup. Overall efficiency: All 3 methods combined are able to achieve a 70-fold efficiency of working with a remote X11 GUI using the highest level of compression over low bandwidth/high latency links 几种远程控制软件介绍

  15. FreeNX 几种远程控制软件介绍

  16. FreeNX ASIPP 几种远程控制软件介绍 16

  17. NoMachine 客户端设置 Custom settings… 可设置执行特定命令，类似与Xstart Note: the "Modem" compression type is the best compression; "LAN" setting does no compression at all. 几种远程控制软件介绍

  18. 背景介绍 The X11 protocol was designed for local area network connections. Because of this fact, several design decisions lead to poor performance over wide area network connections. poor network performance for interactive, GUI-based applications . ASIPP 几种远程控制软件比较 18

  19. NX & VNC FreeNX是近年来继VNC之后新出现的远程控制解决方案，基本原理是将XWindows的信号压缩后传输到远程客户端显示，而VNC是直接截取屏幕图像处理传输。这样，在同样的传输信道条件下，FreeNX可以比VNC提供更好的操作感和实时性。 ASIPP 几种远程控制软件比较 19

  20. 安全性比较 (Free)NX (Free)NX uses the X11 protocol and ssh to make a machine remotely accessible. Due to this implementation, it should not open new security vulnerabilities. VNC It requires that the user chooses a new password for the sharing the desktop. This password is transmitted and stored in an insecure way. This problem can (and should) be mitigated by tunneling the VNC connection via ssh and making the VNC port inaccessible from the network outside. ASIPP 几种远程控制软件比较 20

  21. 遇到的问题 FreeNX在204.12服务器上安装后，普通账号通过客户端登陆，鼠标有响应，而只有数字区键盘能够输入到远程桌面上，而root账号则正常。因此后又安装在205.1上，一切正常。但是205.1在岛外不能访问，应可通过ssh tunnel访问。 下一步计划测试使用VNC和freenx的远程访问可操作性比较，希望可以改善远程控制性能。 ASIPP 遇到的问题 21

  22. 09七室周五例会报告 谢谢！ ASIPP 09七室周五例会报告 22

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