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XCCDF
Guide to the Secure Configuration of Debian 11
System Settings
Network Configuration and Firewalls
iptables and ip6tables
Strengthen the Default Ruleset
Set Default iptables Policy for Forwarded Packets
Set Default iptables Policy for Forwarded Packets
An XCCDF Rule
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Set Default iptables Policy for Forwarded Packets
Medium Severity
To set the default policy to DROP (instead of ACCEPT) for the built-in FORWARD chain which processes packets that will be forwarded from one interface to another, add or correct the following line in
/etc/sysconfig/iptables
:
:FORWARD DROP [0:0]