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

# for ICMPv6 Neighbor Discovery Protocol
# (note: need a corresponding line for each directly attached subnet)
-A INPUT -p ipv6-icmp --icmpv6-type 128 -m conntrack --ctstate NEW -j ACCEPT
-A INPUT -s fe80::/10 -p ipv6-icmp -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

#  accept incoming connections on UDP port 546, to enable DHCPv6
-A UDP -p udp --sport 547 --dport 546 -j ACCEPT


COMMIT