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linux_iptables

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
linux_iptables.txt · Last modified: 2023/03/06 11:31 by 127.0.0.1