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XCCDF
Guide to the Secure Configuration of Red Hat Enterprise Linux 9
System Settings
Network Configuration and Firewalls
iptables and ip6tables
Strengthen the Default Ruleset
Set Default iptables Policy for Incoming Packets
Set Default iptables Policy for Incoming Packets
An XCCDF Rule
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Set Default iptables Policy for Incoming Packets
Medium Severity
To set the default policy to DROP (instead of ACCEPT) for the built-in INPUT chain which processes incoming packets, add or correct the following line in
/etc/sysconfig/iptables
:
:INPUT DROP [0:0]