IP forwarding for IPv4 must not be enabled on AIX unless the system is a router.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-215263	AIX7-00-002064	SV-215263r991589_rule		Medium

Description

IP forwarding permits the kernel to forward packets from one network interface to another. The ability to forward packets between two networks is only appropriate for systems acting as routers.

STIG	Date
IBM AIX 7.x Security Technical Implementation Guide	2024-08-16

Details

Check Text (C-16461r294240_chk)

From the command prompt, run the following command:

# no -o ipforwarding
ipforwarding = 0

If the value returned is not "0", this is a finding.

Fix Text (F-16459r294241_fix)

Disable IPv4 forwarding on the system by running command:
# no -p -o ipforwarding=0