Reset PF Firewall Automatically While Testing Configuration With Remote Server Over SSH Session

If you are testing a new configuration for the PF firewall on a BSD system (such as FreeBSD or OpenBSD) using a remote server over an SSH session, and you want to reset the firewall automatically if the configuration does not work as expected, you can use the following steps:

1. Save the current firewall configuration to a file:

pfctl -sr > current.conf

2. Test the new configuration by loading it into the firewall:

pfctl -f new.conf

3. If the new configuration is not working as expected, you can reset the firewall to the saved configuration by running the following command:

pfctl -f current.conf

This will restore the firewall to the saved configuration, effectively undoing any changes made by the new configuration.

It's a good idea to test new firewall configurations carefully, as a misconfigured firewall can disrupt network connectivity and cause other issues. By saving the current configuration and using the pfctl command to switch between the current and new configurations, you can easily test and revert changes to the firewall as needed.