Firewall for Linux

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Firewall

CentOS 6

system-config-firewall-tui

If the package is not installed you can install it by using the following yum command.

yum install system-config-securitylevel-tui

CentOS 7

systemctl stop firewalld
systemctl disable firewalld

selinux

To disable selinux on CentOS 6 and 7

vi /etc/selinux/config

and set SELINUX

SELINUX=disabled

or

sed -i s/SELINUX=enforcing/SELINUX=disabled/g /etc/selinux/config