https://www.theurbanpenguin.com/rp_filter-and-lpic-3-linux-security/

https://help.ubuntu.com/community/IptablesHowTo

[[ NEWFW ]]

• [root@syslog ~]# vi /etc/sysconfig/iptables
• # Generated by iptables-save v1.4.7 on Wed Jul 20 17:58:53 2016
• *mangle
• :PREROUTING ACCEPT [1153:130274]
• :INPUT ACCEPT [1150:130064]
• :FORWARD ACCEPT [0:0]
• :OUTPUT ACCEPT [25:2721]
• :POSTROUTING ACCEPT [25:2721]
• -A PREROUTING -p tcp -m tcp –dport 135:139 -j DROP
• -A PREROUTING -p udp -m udp –dport 135:139 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 445 -j DROP
• -A PREROUTING -p udp -m udp –dport 445 -j DROP
• -A PREROUTING -p udp -m multiport –ports 445,1433,1434,2002,4156,1978,27444,10100,1812,10064,389,6346 -j DROP
• -A PREROUTING -p tcp -m multiport –ports 445,1433,1434,2002,4156,1978,27444,10100,1812,10064,389,6346 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 25 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 110 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 143 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 80 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 8080 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 123 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 53 -j DROP
• -A PREROUTING -p udp -m udp –dport 53 -j DROP
• “/etc/sysconfig/iptables” 49L, 2257C
• # Generated by iptables-save v1.4.7 on Wed Jul 20 17:58:53 2016
• *mangle
• :PREROUTING ACCEPT [1153:130274]
• :INPUT ACCEPT [1150:130064]
• :FORWARD ACCEPT [0:0]
• :OUTPUT ACCEPT [25:2721]
• :POSTROUTING ACCEPT [25:2721]
• -A PREROUTING -p tcp -m tcp –dport 135:139 -j DROP
• -A PREROUTING -p udp -m udp –dport 135:139 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 445 -j DROP
• # Generated by iptables-save v1.4.7 on Wed Jul 20 17:58:53 2016
• *mangle
• :PREROUTING ACCEPT [1153:130274]
• :INPUT ACCEPT [1150:130064]
• :FORWARD ACCEPT [0:0]
• :OUTPUT ACCEPT [25:2721]
• :POSTROUTING ACCEPT [25:2721]
• -A PREROUTING -p tcp -m tcp –dport 135:139 -j DROP
• -A PREROUTING -p udp -m udp –dport 135:139 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 445 -j DROP
• -A PREROUTING -p udp -m udp –dport 445 -j DROP
• -A PREROUTING -p udp -m multiport –ports 445,1433,1434,2002,4156,1978,27444,10100,1812,10064,389,6346 -j DROP
• -A PREROUTING -p tcp -m multiport –ports 445,1433,1434,2002,4156,1978,27444,10100,1812,10064,389,6346 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 25 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 110 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 143 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 80 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 8080 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 123 -j DROP
• -A PREROUTING -p tcp -m tcp –dport 53 -j DROP
• -A PREROUTING -p udp -m udp –dport 53 -j DROP
• -A PREROUTING -p udp -m udp –dport 123 -j DROP
• COMMIT
• # Completed on Wed Jul 20 17:58:53 2016
• # Generated by iptables-save v1.4.7 on Wed Jul 20 17:58:53 2016
• *filter
• :INPUT ACCEPT [0:0]
• :FORWARD ACCEPT [0:0]
• :OUTPUT ACCEPT [1047:203052]
• :syn_flood - [0:0]
• -A INPUT -m state –state RELATED,ESTABLISHED -j ACCEPT
• -A INPUT -p icmp -j ACCEPT
• -A INPUT -i lo -j ACCEPT
• -A INPUT -p tcp -m state –state NEW -m tcp –dport 2222 -j ACCEPT
• -A INPUT -p tcp -m state –state NEW -m tcp –dport 80 -j ACCEPT
• -A INPUT -p tcp -m state –state NEW -m tcp –dport 8000 -j ACCEPT
• -A INPUT -p udp -m state –state NEW -m udp –dport 514 -j ACCEPT
• -A INPUT -p tcp -m state –state NEW -m tcp –dport 514 -j ACCEPT
• -A INPUT -j REJECT –reject-with icmp-host-prohibited
• -A INPUT -p icmp -m limit –limit 1/sec –limit-burst 1 -j ACCEPT
• -A INPUT -p icmp -m limit –limit 1/sec –limit-burst 1 -j LOG –log-prefix “PING-DROP:”
• -A INPUT -p icmp -j DROP
• -A INPUT -p tcp -m tcp –tcp-flags FIN,SYN,RST,ACK SYN -j syn_flood
• -A FORWARD -j REJECT –reject-with icmp-host-prohibited
• -A OUTPUT -p icmp -j ACCEPT
• -A syn_flood -m limit –limit 1/sec –limit-burst 3 -j RETURN
• -A syn_flood -j DROP
• COMMIT
• # Completed on Wed Jul 20 17:58:53 2016