What recommendations can you give in the protection with Intrusion Prevention System?

You can write what is better to do there

The IPS wiki page gives info on setting it up.
https://wiki.ipfire.org/configuration/firewall/ips

There are also a couple of pages on the rulesets and the rule selection.
https://wiki.ipfire.org/configuration/firewall/ips/rulesets
https://wiki.ipfire.org/configuration/firewall/ips/rule-selection

There is also this IPFire Blog post on IPS configuration that is worth a read through.
https://blog.ipfire.org/post/ips-configuration-recommendations-for-ipfire-users

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