ERROR: problem running iptables: modprobe: FATAL: Module ip_tables not found in directory /lib/modules/5.10.123-meson64 - Odroid HC4 - Armbian Community Forums
iptables: How to use the limits module | The Lowe Down
Illustrated introduction to Linux iptables
GitHub - ydahhrk/iptables-mod-example: Minimalistic iptables module, so I can use as a base for future throwaway tests.
Connection tracking (conntrack) - Part 1: Modules and Hooks [Thermalcircle.de]