If you don't understand iptables, you are cooked - Part 1: Building a Router
A hands-on deep dive into what iptables really is, and a lab that turns a plain Linux box into a NAT router with a single MASQUERADE rule.
Materials by Tran Xuan Thang
All materials
This playground was created by an iximiuz Labs user and is provided with no warranty.
iptables Container Port Lab
Two plain Linux hosts - no Docker - for building a container out of a network namespace and publishing its port with nothing but nat rules. Companion playground for the tutorial "If you don't understand iptables, you are cooked - Part 2".
This playground was created by an iximiuz Labs user and is provided with no warranty.
iptables NAT Router Lab
Two VMs: no-internet sits on a private LAN with no route out; have-internet is dual-homed with real internet access. Turn have-internet into a NAT router for the tutorial "If you don't understand iptables, you are cooked - Part 1".