标签：accept pre for put reject drop syn related htm
请参考博客 ： http://blog.chinaunix.net/uid-27057175-id-5119553.html
大概可以认为这两个东西是一个东西，可以相互代替，不过conntrack是用来代替state的
网上说state就是conntrack 的 alias
iptables state经典用法
iptables -I INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT
iptables conntrack经典用法
iptables -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp -m conntrack --ctstate NEW -m tcp --dport 22 -j ACCEPT
iptables文件使用state的默认规则
*filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [60:7140] -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 multiport --dports 22,80,443 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT
iptables文件使用conntrack的默认规则
# Generated by iptables-save v1.4.18 on Sun Mar 17 14:21:12 2013 *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 -A INPUT -p icmp -m icmp --icmp-type 8 -m conntrack --ctstate NEW -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 icmp-port-unreachable -A INPUT -p tcp -j REJECT --reject-with tcp-reset -A INPUT -j REJECT --reject-with icmp-proto-unreachable COMMIT # Completed on Sun Mar 17 14:21:12 2013
标签：accept pre for put reject drop syn related htm
原文地址：https://www.cnblogs.com/faberbeta/p/iptables002.html
