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V-22418

CAT III (Low)

The system must log martian packets.

Rule ID

SV-45728r1_rule

STIG

SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Version

V1R12

CCIs

CCI-000126

Discussion

Martian packets are packets containing addresses known by the system to be invalid. Logging these messages allows the SA to identify misconfigurations or attacks in progress.

Check Content

Verify the system logs martian packets.

# grep [01] /proc/sys/net/ipv4/conf/*/log_martians|egrep "default|all"

If all of the resulting lines do not end with "1", this is a finding.

Fix Text

Configure the system to log martian packets.
Edit /etc/sysctl.conf and add a setting for "net.ipv4.conf.all.log_martians=1" and "net.ipv4.conf.default.log_martians=1". 

Reload the sysctls.
Procedure:
# sysctl -p