Thorsten Schubert writes:
To fix this, a direct rule inside the *raw* table for matching the ipset should suffice. I did some testing this time and came up with the following:firewall-cmd --permanent --new-ipset=test --type=hash:ip --option=family=inet firewall-cmd --permanent --direct --add-rule ipv4 raw PREROUTING 0 -m set --match-set test src -j DROP firewall-cmd --reload
Rather than a --reload, I reran it without the --permanent flag, due to fail2ban also dropping its own firewall rules, on the fly.
Also, a hash::net ipset will be better, giving an option to drop an entire subnet.
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