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# Firewall

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.

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.

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.

Advanced

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

<port-number>/<protocol>

- <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.

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

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

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