| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Default deny configured' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny 0.0.0.0' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny 10.0.0.0' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny 127.0.0.0' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny 169.254.0.0' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny 172.16.0.0' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny 192.0.2.0' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny 192.168.0.0' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny 224.0.0.0' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny host 255.255.255.255' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks - 'Deny internal networks' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
| 3.2.1 Set 'ip access-list extended' to Forbid Private Source Addresses from External Networks -'External interface has ACL applied' | CIS Cisco IOS 12 L2 v4.0.0 | Cisco | SYSTEM AND COMMUNICATIONS PROTECTION |
