IPTABLES VS FIREWALLD | Unixmen
How to open a port for iptables • Linux Hub sudo iptables-t filter-A INPUT-p tcp-s 192.168.3.0/24 --dport 445-m state --state ESTABLISHED -j DROP This command in the filter table in the INPUT chain will write a rule for TCP, from the computer in the network 192.168.3.0/24, destination port 445 (as chain member, the destination port is on this computer) for packets coming in through an open connection, to apply the action DROP (drop the packet). iptables state 状态防火墙_Linux教程_Linux公社-Linux系统门户网站 --state ESTABLISHED 已建立连接--state RELATED 相关的--state INVALID 无效的. icmp 实验 通 NEW ESTABLISHED 不通 NEW ESTABLISHED RELATED INVALID 出去 iptables -t filter -A OUTPUT -p icmp -m icmp --icmp-type echo-request -m state --state NEW -j LOG --log-prefix "OUT_ICMP_NEW"
10 iptables rules to help secure your Linux box - TechRepublic
--state ESTABLISHED 已建立连接--state RELATED 相关的--state INVALID 无效的. icmp 实验 通 NEW ESTABLISHED 不通 NEW ESTABLISHED RELATED INVALID 出去 iptables -t filter -A OUTPUT -p icmp -m icmp --icmp-type echo-request -m state --state NEW -j LOG --log-prefix "OUT_ICMP_NEW" Established Connections-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT. Packets with the “new” state are checked with our first rule, we drop “invalid” packets so at the end we can accept all “related” and “established” packets. Hopefully this iptables example gives you a template to work on.
Linux iptables Command Examples and Guide
Aug 29, 2017 Iptables Essentials: Common Firewall Rules and Commands Aug 10, 2015 IptablesHowTo - Community Help Wiki