Title

AIX must be configured with a default gateway for IPv4 if the system uses IPv4, unless the system is a router. (Cat II impact)

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>

Additional Identifiers

Rule ID: SV-215262r991589_rule

Vulnerability ID: V-215262

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.