防火牆

防火牆 +

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This section allows you to configure some simple firewall rules: they + determine which type of message from the Internet will be accepted by the + target system. This, in turn, allows the corresponding services on the + system to be accessible from the Internet. +

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In the default setting (no button is checked), no service of the system is + accessible from the network. The Everything (no + firewall) option enables access to all services of the machine - + an option that does not make much sense in the context of the installer + since it would create a totally unprotected system. Its veritable use is in + the context of the Mageia Control Center (which uses the same GUI layout) + for temporarily disabling the entire set of firewall rules for testing and + debugging purposes. +

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All other options are more or less self-explanatory. As an example, you will + enable the CUPS server if you want printers on your machine to be accessible + from the network. +

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Advanced

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The Advanced option opens a window where you can enable + a series of services by typing a list of “couples” (blank + separated) +

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<port-number>/<protocol>

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- <port-number> is the value of the port assigned + to the service you want to enable (e.g. 873 for the RSYNC service) as + defined in RFC-433; +

- <protocol> is one of TCP + or UDP - the internet protocol that is used by the + service. +

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For instance, the entry for enabling access to the RSYNC service therefore + is 873/tcp. +

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In case a service is implemented to use both protocols, you specify 2 + couples for the same port. +

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