Simple iptables

iptables.generic

cat > /tmp/iptables.generic <<EOF
*filter
:INPUT DROP [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:LOGGING - [0:0]
-A INPUT -i lo -j ACCEPT
-A INPUT -d 127.0.0.0/8 ! -i lo -j REJECT --reject-with icmp-port-unreachable
-A INPUT -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j DROP
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -m state --state INVALID -j DROP
-A INPUT -i eth0 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 443 -j ACCEPT
-A INPUT -i eth0 -p udp -m udp --sport 6277 --dport 1024:65535 -j ACCEPT
-A INPUT -p tcp -m multiport --dports 25,110,220,465,587,993,995,4190 -j ACCEPT
-A INPUT -i eth0 -p icmp -m icmp --icmp-type 0 -m limit --limit 2/sec -j ACCEPT
-A INPUT -i eth0 -p icmp -m icmp --icmp-type 8 -m limit --limit 2/sec -j ACCEPT
-A INPUT -j LOGGING
-A INPUT -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -j REJECT --reject-with icmp-port-unreachable
-A OUTPUT -o eth0 -p icmp -m icmp --icmp-type 8 -j ACCEPT
-A OUTPUT -o eth0 -p icmp -m icmp --icmp-type 0 -j ACCEPT
-A OUTPUT -o eth0 -p tcp -m tcp --dport 53 -j ACCEPT
-A OUTPUT -o eth0 -p udp -m udp --dport 53 -j ACCEPT
-A OUTPUT -j ACCEPT
-A LOGGING -p tcp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "iptables: [denied TCP] " --log-level 7
-A LOGGING -p udp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "iptables: [denied UDP] " --log-level 7
-A LOGGING -p icmp -m limit --limit 5/min --limit-burst 10 -j LOG --log-prefix "iptables: [denied ICMP] " --log-level 7
COMMIT
EOF

iptables-restore</tmp/iptables.generic