TOSS 5 must log IPv4 packets with impossible addresses.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-282687 | TOSS-05-000215 | SV-282687r1201041_rule | CCI-000366 | 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 | |||
| Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide | 2026-04-01 | |||
Details
Check Text (C-282687r1201041_chk)
Verify TOSS 5 logs IPv4 martian packets using the following command:
$ sudo sysctl net.ipv4.conf.all.log_martians
net.ipv4.conf.all.log_martians = 1
If "net.ipv4.conf.all.log_martians" is not set to "1", or a line is not returned, this is a finding.
Fix Text (F-87153r1201040_fix)
Configure TOSS 5 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 using the following command:
$ sudo sysctl --system