iptables-extension
There are 3 repositories under iptables-extension topic.
apernet/iptables-mod-randmap
An iptables extension for stateless address / port randomization.
landhb/DrawBridge
Layer 4 Single Packet Authentication Linux kernel module utilizing Netfilter hooks and kernel supported Berkeley Packet Filters (BPF)
m4ttr/skmark
netfilter skmark