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XCCDF
Guide to the Secure Configuration of Ubuntu 20.04
System Settings
Network Configuration and Firewalls
iptables and ip6tables
Inspect and Activate Default Rules
Set configuration for loopback traffic
Set configuration for loopback traffic
An XCCDF Rule
Details
Profiles
Prose
Set configuration for loopback traffic
Medium Severity
Configure the loopback interface to accept traffic. Configure all other interfaces to deny traffic to the loopback network.