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Runtime and permanent settings
Any changes made while firewalld is running will be lost when firewalld is restarted. When firewalld is restarted, the settings revert to their permanent values.
These changes are said to be made in _runtime mode_.
To make the changes persistent across reboots, apply them again using the `--permanent` option. Alternatively, to make changes persistent while firewalld is running, use the `--runtime-to-permanent _firewall-cmd_` option.
If you make changes while firewalld is running using only the `--permanent` option, they do not become effective until firewalld is restarted. However, restarting firewalld briefly stops the networking traffic, causing disruption to your system.