Legacy IP tables support

modulename: ip_tables.ko

configname: CONFIG_IP_NF_IPTABLES_LEGACY

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>Network packet filtering framework (Netfilter)
└─>IP: Netfilter Configuration
└─>Legacy IP tables support
In linux kernel since version 4.19.314 (release Date: 2024-05-17)  
iptables is a legacy packet classifier.
This is not needed if you are using iptables over nftables
(iptables-nft).

source code: