For systems using DNS resolution, at least two name servers must be configured.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22331	GEN001375	SV-26424r1_rule	ECSC-1	Low

Description
To provide availability for name resolution services, multiple redundant name servers are mandated. A failure in name resolution could lead to the failure of security functions requiring name resolution, which may include time synchronization, centralized authentication, and remote system logging.

STIG	Date
UNIX SRG	2013-03-26

Details

Check Text ( C-27500r1_chk )
Determine if DNS is enabled on the system. # grep dns /etc/nsswitch.conf If no line is returned, or any returned line is commented out, the system does not use DNS, and this is not applicable. Determine the name servers used by the system. # grep nameserver /etc/resolv.conf If less than two lines are returned that are not commented out, this is a finding.

Fix Text (F-23611r1_fix)
Edit /etc/resolv.conf and add additional nameserver lines until at least two are present.