*filter :INPUT ACCEPT [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [4:208] :TCP - [0:0] :UDP - [0:0] -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m conntrack --ctstate INVALID -j DROP -A INPUT -p icmpv6 -m icmpv6 --icmpv6-type 8 -m conntrack --ctstate NEW -j ACCEPT -A INPUT -p udp -m conntrack --ctstate NEW -j UDP -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -m conntrack --ctstate NEW -j TCP -A INPUT -p udp -j REJECT --reject-with icmp6-port-unreachable -A INPUT -p tcp -j REJECT --reject-with tcp-reset -A INPUT -j REJECT COMMIT