Im new to DA and i'll be appreciated for every answer/help .
I have a hardware firewall with servers behind it and they work fine, now i want to add a linux box with DA but im not sure if it could works behind the firewall?
DirectAdmin requires a routable IP# working on the server for license verification. There are no officially supported workarounds but if you search these forums you may find unsupported workarounds in other posts.
Yes, the guide will make DA run on a LAN.
It's not currently "official", but the features in the guide will eventually become official, once it's got more "polish".