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Old 06-30-2020, 09:10 AM   #1
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Registered: Jun 2020
Posts: 17

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Question Fail2ban not adding rules to Iptables

hi, im using Ubuntu 20.04 LTS with latest Fail2ban(not sure why it say command not found when i try to find its version with 'fail2ban -V')

all is working, so im thinking of learn to harden the security by adding more Jails by following the links below. manage to add few and confirm it has been add as it show the extra Jail when i run this 'sudo fail2ban-client status'

but the thing is, the new Jail is not shown inside my Iptables when i run 'sudo iptables -S'. Only noticeable is 'f2b-sshd' - installed by default together with Fail2ban. According to the article, it should list this(notice there are no 443 as i taken that out from the Jail bcoz 443 is used by another program)-
-A INPUT -p tcp -m multiport --dports 80 -j fail2ban-nginx-noproxy
-A INPUT -p tcp -m multiport --dports 80 -j fail2ban-nginx-badbots
-A INPUT -p tcp -m multiport --dports 80 -j fail2ban-nginx-noscript

is it bcoz my current iptables rules(port 80?) conflicting with them? and how could we fix it?
-N f2b-sshd
-A INPUT -p tcp -m multiport --dports 22 -j f2b-sshd
-A INPUT -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j DROP
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP
-A INPUT -i tap+ -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -p tcp -m tcp --dport 443 -j ACCEPT
-A INPUT -p udp -m udp --dport 1194 -j ACCEPT
-A INPUT -p udp -m udp --dport 500 -j ACCEPT
-A INPUT -p udp -m udp --dport 4500 -j ACCEPT
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A f2b-sshd -s -j REJECT --reject-with icmp-port-unreachable
-A f2b-sshd -s -j REJECT --reject-with icmp-port-unreachable
-A f2b-sshd -j RETURN

p/s - just go through the article again before submitting, and notice this is also missing at the top of my iptables -
-N fail2ban-nginx-badbots
-N fail2ban-nginx-noproxy
-N fail2ban-nginx-noscript

p/ss - or is it bcoz theres no ban yet? if thats true, whats the easiest way to test and confirm they works?

Thank you,

Last edited by aboka; 06-30-2020 at 09:58 AM.
Old 06-30-2020, 10:30 PM   #2
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Registered: Jun 2020
Posts: 17

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hi, hv confirmed it is not there as there are not trigger yet. thx


fail2ban, ubuntu

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