Linux iptables firewall release the relevant port to reject the relevant port and view the open port

1. View the ports on which the Iptables firewall is open:/etc/init.d/iptables status

[[email protected] ~]#/etc/rc.d/init.d/iptables status or service iptables status
Table:filter
Chain INPUT (Policy ACCEPT)
Num Target prot opt source destination
1 ACCEPT TCP--0.0.0.0/0 0.0.0.0/0 TCP dpt:3306

Chain FORWARD (Policy ACCEPT)
Num Target prot opt source destination

Chain OUTPUT (Policy ACCEPT)
Num Target prot opt source destination

2. Turn on the TCP 8080 port

/sbin/iptables-i input-p TCP--dport 8080-j ACCEPT

/etc/rc.d/init.d/iptables Save or service iptables save #保存配置/etc/rc.d/init.d/iptables Restart or service iptables Resta RT #重启服务

[[email protected] ~]#/sbin/iptables-i input-p TCP--dport 8080-j ACCEPT
[Email protected] ~]#/etc/rc.d/init.d/iptables Save
iptables:saving firewall rules to/etc/sysconfig/iptables:[OK]
[Email protected] ~]#/etc/rc.d/init.d/iptables restart
iptables:flushing firewall rules: [OK]
Iptables:setting chains to Policy Accept:filter [OK]
iptables:unloading modules: [OK]
iptables:applying firewall rules: [OK]

[[Email protected] ~]# service iptables status
Table:filter
Chain INPUT (Policy ACCEPT)
Num Target prot opt source destination
1 ACCEPT TCP--0.0.0.0/0 0.0.0.0/0 TCP dpt:8080
2 ACCEPT TCP--0.0.0.0/0 0.0.0.0/0 TCP dpt:3306

3. Delete chain input to specify Rule 1;

[[email protected] ~]# iptables-d INPUT 1
[[Email protected] ~]# service iptables status
Table:filter
Chain INPUT (Policy ACCEPT)
Num Target prot opt source destination
1 ACCEPT TCP--0.0.0.0/0 0.0.0.0/0 TCP dpt:3306

Chain FORWARD (Policy ACCEPT)
Num Target prot opt source destination

Chain OUTPUT (Policy ACCEPT)
Num Target prot opt source destination

4.Reject designated port;

[[email protected] ~]#/sbin/iptables-i input-p TCP--dport 8080-j REJECT
[[Email protected] ~]# service iptables status
Table:filter
Chain INPUT (Policy ACCEPT)
Num Target prot opt source destination
1 REJECT TCP--0.0.0.0/0 0.0.0.0/0 TCP dpt:8080 reject-with icmp-port-unreachable
2 ACCEPT TCP--0.0.0.0/0 0.0.0.0/0 TCP dpt:3306

Chain FORWARD (Policy ACCEPT)
Num Target prot opt source destination

Chain OUTPUT (Policy ACCEPT)
Num Target prot opt source destination

Linux iptables firewall release the relevant port to reject the relevant port and view the open port