Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuel d'installation télécharger pdf (Page 253)

Chapter 13. Miscellaneous tasks 233

This command failed, because XliveCD requires an explicit command to allow remote hosts

to connect to it. When the command xhost + (plus means to add authorized hosts) is run,

xclock can finally display on Windows, as shown in Figure 13-2. Remember the program

itself runs on a remote Linux.

Run the following command again. You should get a positive output this time.

gpok224:~ # xclock &

[1] 21915

Figure 13-2 Manual setting of DISPLAY variable

The xhost + command allows any host to access the X Window System server. From a

security point of view, this may not be a good idea. Even allowing just specific hosts is not

enough, because the X Window System 11 protocol itself is not secure. Using SSH tunneling

removes this security exposure. SSH tunneling also prevents firewalls and NAT from

breaking X Window System 11 communications.

It is possible to use an external SSH client that allows X Window System 11 forwarding, or

SSH client embedded in XliveCD itself.

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Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuel d'installation Page 253