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XCCDF
Guide to the Secure Configuration of Ubuntu 16.04
System Settings
Network Configuration and Firewalls
nftables
Nftables Chain Names
Nftables Chain Names
An XCCDF Value
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Nftables Chain Names
The rules in nftables are attached to chains. Unlike in iptables, there are no predefined chains like INPUT, OUTPUT, etc. Instead, to filter packets at a particular processing step, a base chain with a chosen name should be created, and attached it to the appropriate Netfilter hook.