I just installed OpenWRT, but I have difficulties understanding the relation and meaning of forwardings, firewall chains and rules.
I noticed that there are forwardings that define where traffic originating from a specific zone can be forwarded, but I also noticed that forwarded traffic must be accepted at the destination zone (only visible by editing a zone). Then there is the input/output/forward chains that accept, reject or drop traffic. Where is that applied (interfaces?), what chains do what exactly (is input related to traffic going into a network?)? And lastly the rules, are the rules applied before they hit the chain policy?
I have to say that I found the documentation a bit unclear these topics. If someone can help me understand how this works I would be happy to help setting up some documentation for the website.