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V-215262

CAT II (Medium)

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

Rule ID

SV-215262r991589_rule

STIG

IBM AIX 7.x Security Technical Implementation Guide

Version

V3R2

CCIs

CCI-000366

Discussion

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.

Check Content

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

Set a default gateway for IPv4 using:
# route add 0 <ip address of gateway>