The system must log martian packets.

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

Part of GEN003611

Associated with: CCI-000126

SV-45728r1_rule The system must log martian packets.

Vulnerability 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

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