Set iptables firewall whitelist in Linux (RHEL 6 and CentOS 7)

Set iptables firewall whitelist in Linux (RHEL 6 and CentOS 7)

Go to the Linux Command Line and edit the firewall rule configuration file iptables.
Vi/etc/sysconfig/iptables

The following is an example of whitelist settings:

# Firewall configuration written by system-config-securitylevel
# Manual customization of this file is not recommended.
* Filter
: Input accept [0: 0]
: Forward accept [0: 0]
: Output accept [0: 0]
: RH-Firewall-1-INPUT-[0: 0]

-N whitelist
-A whitelist-s 10.202.106.1-j ACCEPT
-A whitelist-s 10.202.106.2-j ACCEPT
-A whitelist-s 10.202.106.3-j ACCEPT
-A whitelist-s 10.202.106.4-j ACCEPT
-A whitelist-s 10.202.106.5-j ACCEPT
-A whitelist-s 10.202.106.6-j ACCEPT
-A whitelist-s 10.202.106.7-j ACCEPT

-A input-j RH-Firewall-1-INPUT
-A forward-j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT-I lo-j ACCEPT
-A RH-Firewall-1-INPUT-p icmp -- icmp-type any-j ACCEPT
-An RH-Firewall-1-INPUT-p 50-j ACCEPT
-An RH-Firewall-1-INPUT-p 51-j ACCEPT
-A RH-Firewall-1-INPUT-p udp -- dport 5353-d 224.0.0.20.- j ACCEPT
-A RH-Firewall-1-INPUT-p udp-m udp -- dport 631-j ACCEPT
-A RH-Firewall-1-INPUT-p tcp-m tcp -- dport 631-j ACCEPT
-A RH-Firewall-1-INPUT-m state -- state ESTABLISHED, RELATED-j ACCEPT
-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 22-j ACCEPT
-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 4750-j ACCEPT
-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 3306-j whitelist
-A RH-Firewall-1-INPUT-j REJECT -- reject-with icmp-host-prohibited

In COMMIT, the whitelist settings are as follows:

-N whitelist
-A whitelist-s 10.202.106.1-j ACCEPT
-A whitelist-s 10.202.106.2-j ACCEPT
-A whitelist-s 10.202.106.3-j ACCEPT
-A whitelist-s 10.202.106.4-j ACCEPT
-A whitelist-s 10.202.106.5-j ACCEPT
-A whitelist-s 10.202.106.6-j ACCEPT
-A whitelist-s 10.202.106.7-j ACCEPT

Use the j parameter to specify the whitelist rules:

-A RH-Firewall-1-INPUT-m state -- state NEW-m tcp-p tcp -- dport 3306-j whitelist

For more iptables tutorials, see the following:

Disable the default firewall in CentOS 7.0 and enable the iptables firewall.

Iptables examples

Linux Firewall iptables

Basic use of iptables backup, recovery, and firewall scripts

Detailed description of firewall iptables usage rules in Linux

Iptables firewall settings in Linux

This article permanently updates the link address: