A.iptables -D FORWARD -s udp -p tcp -tcp-flags SYN,ACK,FIN,RST RST -ma limit --limit 1/s -j ACCEPT B.iptables -A FORWARD -p tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s -j ACCEPT C.iptables -A FORWARD -s udp -p tcp --tcp-flags SYN,ACK,FIN,RST RST -ma limit --limit 1/s -j ACCEPT D.iptables -A FORWARD -s tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s -j ACCEPT