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XCCDF
Guide to the Secure Configuration of Ubuntu 16.04
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]