22.14. Configure the Firewall to Allow Incoming NTP Packets
NTPtraffic consists of
UDPpackets on port
123and needs to be permitted through network and host-based firewalls in order for
22.14.1. Configure the Firewall Using the Graphical Tool
NTPto pass through the firewall, using the graphical tool system-config-firewall, issue the following command as root:
~]#The Firewall Configuration window opens. Select Other Ports from the list on the left. Click Add. The Port and Protocol window opens. Click on one of the port numbers and start typing
123. Select the “port 123” entry with udp as the protocol. Click OK. The Port and Protocol window closes. Click Apply in the Firewall Configuration window to apply the changes. A dialog box will pop up to ask you to confirm the action, click Yes. Note that any existing sessions will be terminated when you click Yes.