The network element must use two or more NTP servers to synchronize time.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-23747	NET0812	SV-41499r1_rule		Low

Description
Without synchronized time, accurately correlating information between devices becomes difficult, if not impossible. If you cannot successfully compare logs between each of your routers, switches, and firewalls, it will be very difficult to determine the exact events that resulted in a network breach incident. NTP provides an efficient and scalable method for network elements to synchronize to an accurate time source.

Description

Without synchronized time, accurately correlating information between devices becomes difficult, if not impossible. If you cannot successfully compare logs between each of your routers, switches, and firewalls, it will be very difficult to determine the exact events that resulted in a network breach incident. NTP provides an efficient and scalable method for network elements to synchronize to an accurate time source.

STIG	Date
Firewall Security Technical Implementation Guide - Cisco	2016-12-21

Details

Check Text ( C-39978r1_chk )
Review the firewall configurations and verify that two or more NTP servers have been defined similar to the following example: ntp server 10.1.0.5 key 1 source mgmt ntp server 10.1.0.8 key 1 source mgmt ntp authenticate ntp authentication-key 1 md5 ******** ntp trusted-key 1

Fix Text (F-3044r2_fix)
Configure the device to use two separate NTP servers.