AlmaLinux OS 9 must log packets with impossible addresses.
An XCCDF Rule
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.
- ID
- SV-269251r1050133_rule
- Version
- ALMA-09-019380
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Configure AlmaLinux OS 9 to log martian packets.
Create a numbered *.conf file in /etc/sysctl.d/ with the following content:
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1