Jé pa l'temps #11 - Iptables

Best practice with the firewall : we block all traffic and authorize what we need and of course, RTFM !

Displaying iptables rules

sudo iptables -L --line-numbers

By default, this command only displays filter table. For displaying others tables, we have to add -t option following by nat, mangle or raw. However, filter table is the only needed table for configuring firewall.

Command options

-A CHAIN : Append a rule on the chain.