I configured suricata as an IPS by following this tutorial - https://www.digitalocean.com/community/tutorials/how-to-configure-suricata-as-an-intrusion-prevention-system-ips-on-ubuntu-20-04. But the system is not dropping the packets even after I modified the rule woth sid 2100498 from alert to modify in the suricata.rules. yet this is just creating the alert and not dropping the packet when i test it out. Can anyone help me
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You can inspect the local rules file -
/var/lib/suricata/rules/local.rulesand check if you have any allow rules before the block ones. This might cause a similar experience.
Hope that this helps!