OL 9 must log IPv4 packets with impossible addresses.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271866 | OL09-00-006022 | SV-271866r1092310_rule | Medium |
| Description |
| The presence of "martian" packets (which have impossible addresses) as well as spoofed packets, source-routed packets, and redirects could be a sign of nefarious network activity. Logging these packets enables this activity to be detected. |
| STIG | Date |
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 |
Details
| Check Text (C-75916r1092308_chk) |
| Verify that OL 9 logs IPv4 martian packets. Check the value of the accept source route variable with the following command: $ sysctl net.ipv4.conf.all.log_martians net.ipv4.conf.all.log_martians = 1 If the returned line does not have a value of "1", a line is not returned, or the line is commented out, this is a finding. |
| Fix Text (F-75823r1092309_fix) |
| Configure OL 9 to log martian packets on IPv4 interfaces. Add or edit the following line in a single system configuration file in the "/etc/sysctl.d/" directory: net.ipv4.conf.all.log_martians=1 Load settings from all system configuration files with the following command: $ sudo sysctl --system |