Enable and disable Linuxiptables firewall

Enabling and disabling the Linux firewall (iptables) is mainly for setting and managing iptables. 1. linux firewall (Iptables) restarts the system to take effect. Enable: chkconfigiptableson is disabled: chkconfigiptablesoff2.Linux firewall (Iptables) takes effect immediately. Enable after restart: ser

Linux firewall(Iptables).

The firewall in Linux mainly sets and manages iptables.

1. Linux firewall (Iptables) restarts the system to take effect

Enable: chkconfig iptables on

Close: chkconfig iptables off

2. the Linux firewall (Iptables) takes effect immediately and becomes invalid after restart.

Enable: service iptables start

Disable: service iptables stop

You can use the preceding command to enable or disable other services in Linux.

When Linux firewall (Iptables) is enabled, set ports 25 and 110 as follows,

Modify the/etc/sysconfig/iptables file and add the following content:

-A RH-Firewall-1-INPUT-m state -- state NEW-p tcp-m tcp -- dport 25 -- syn-j ACCEPT

-A RH-Firewall-1-INPUT-m state -- state NEW-p tcp-m tcp -- dport 110 -- syn-j ACCEPT