IPTables are acting as firewall on Linux machines, We can configure access rules using IPTables. This is pre-installed in most of the Linux machines. We can use below commands to start,stop and see the status of the IPTables in Linux. We need root access to execute below commands

To start IPtables:
systemctl start iptables

To stop IPtables:
systemctl stop iptables

To check status of  IPtables:
systemctl status iptables

We can use above commands to restart,stop checking the status of IPTables in Linux