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AIX 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-215262 AIX7-00-002063 SV-215262r508663_rule 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
IBM AIX 7.x Security Technical Implementation Guide 2023-08-23

Details

Check Text ( C-16460r294237_chk )
Check the system for an IPv4 default route using command:

# netstat -r |grep default
default 10.11.20.1 UG 1 1811 en0 - -

If a default route is not defined, this is a finding.
Fix Text (F-16458r294238_fix)
Set a default gateway for IPv4 using:
# route add 0