# Filter
*filter
:INPUT DROP [0:0]
:FORWARD DROP [0:0]
:OUTPUT ACCEPT [6:359]
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP
-A INPUT -p tcp -m tcp ! --tcp-flags FIN,SYN,RST,ACK SYN -m state --state NEW -j DROP
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type 8 -m conntrack --ctstate NEW -j ACCEPT
-A INPUT -p tcp -j REJECT --reject-with tcp-reset
-A INPUT -p udp -j REJECT --reject-with icmp-port-unreachable
COMMIT
# Mangle
*mangle
:PREROUTING ACCEPT [8948:5925361]
:INPUT ACCEPT [8943:5924001]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [10902:1431630]
:POSTROUTING ACCEPT [10965:1438415]
-A OUTPUT -j TOS --set-tos 0x10/0xff # ISPs hate this trick, learn how he gets 10 ping with one single rule
COMMIT
# Raw
*raw
:PREROUTING ACCEPT [8948:5925361]
:OUTPUT ACCEPT [10902:1431630]
COMMIT