STIGQter STIGQter: STIG Summary: Red Hat Enterprise Linux 9 Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 2026:

RHEL 9 must log IPv4 packets with impossible addresses.

DISA Rule

SV-257960r1155727_rule

Vulnerability Number

V-257960

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-09-253025

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure RHEL 9 to log martian packets on IPv4 interfaces.

Create a configuration file if it does not already exist:

$ sudo vi /etc/sysctl.d/99-ipv4_log_martians.conf

Add the following line to the file:
net.ipv4.conf.all.log_martians=1

Reload settings from all system configuration files with the following command:

$ sudo sysctl --system

Check Contents

Verify RHEL 9 logs IPv4 martian packets.

Check the value of the "log_martians" variable with 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 is missing, this is a finding.

Vulnerability Number

V-257960

Documentable

False

Rule Version

RHEL-09-253025

Severity Override Guidance

Verify RHEL 9 logs IPv4 martian packets.

Check the value of the "log_martians" variable with 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 is missing, this is a finding.

Check Content Reference

M

Target Key

5551