The system must be configured with a default gateway for IPv4 if the system uses IPv4, unless the system is a router.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-4397	GEN005560	SV-37918r1_rule	ECSC-1	Medium

Description
If a system has no default gateway defined, the system is at increased risk of man-in-the-middle, monitoring, and Denial of Service attacks.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2017-03-01

Details

Check Text ( C-37145r1_chk )
Check the system for an IPv4 default route. If the system is a VM host and acts as a router solely for the benefit of its client systems, then this rule is not applicable. Procedure: # netstat -r |grep default If a default route is not defined, this is a finding.

Fix Text (F-32410r1_fix)
Set a default gateway for IPv4.