*filter
:INPUT DROP [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:sshguard - [0:0]

-A INPUT -i enp3s0 -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT -m comment --comment "Allow incoming SSH"
-A INPUT -i enp3s0 -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT -m comment --comment "Allow outgoing SSH"
-A INPUT -i enp3s0 -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT -m comment --comment "Allow incoming HTTP"
-A INPUT -i enp3s0 -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT -m comment --comment "Allow incoming HTTPS"
-A INPUT -i enp3s0 -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT -m comment --comment "Allow outgoing HTTP"
-A INPUT -i enp3s0 -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT -m comment --comment "Allow outgoing HTTPS"
-A INPUT -i enp3s0 -p udp --sport 53 -j ACCEPT -m comment --comment "Allow outgoing DNS"

-A INPUT -i lo -j ACCEPT -m comment --comment "Allow ALL from localhost"

-A INPUT -p icmp --icmp-type echo-request -j ACCEPT -m comment --comment "Allow incoming ping"
-A INPUT -p icmp --icmp-type echo-reply -j ACCEPT -m comment --comment "Allow outgoing ping"
-A INPUT -p tcp --dport 80 -m limit --limit 25/minute --limit-burst 100 -j ACCEPT -m comment --comment "Prevent DoS attacks"
-A INPUT -p tcp --dport 443 -m limit --limit 25/minute --limit-burst 100 -j ACCEPT -m comment --comment "Prevent DoS attacks"
-A INPUT -p tcp -m tcp --dport 22 -j sshguard -m comment --comment "SSH access protection"
COMMIT