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The system must log Martian packets.


Finding ID Version Rule ID IA Controls Severity
V-217917 RHEL-06-000088 SV-217917r505923_rule Low
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.
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2020-09-03


Check Text ( C-19398r376766_chk )
The status of the "net.ipv4.conf.all.log_martians" kernel parameter can be queried by running the following command:

$ sysctl net.ipv4.conf.all.log_martians
net.ipv4.conf.all.log_martians = 1

$ grep net.ipv4.conf.all.log_martians /etc/sysctl.conf /etc/sysctl.d/*
net.ipv4.conf.all.log_martians = 1

If "net.ipv4.conf.all.log_martians" is not configured in the /etc/sysctl.conf file or in the /etc/sysctl.d/ directory, is commented out or does not have a value of "1", this is a finding.
Fix Text (F-19396r376767_fix)
To set the runtime status of the "net.ipv4.conf.all.log_martians" kernel parameter, run the following command:

# sysctl -w net.ipv4.conf.all.log_martians=1

Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a config file in the /etc/sysctl.d/ directory (or modify the line to have the required value):

net.ipv4.conf.all.log_martians = 1

Issue the following command to make the changes take effect:

# sysctl --system