cross-posted to: https://sh.itjust.works/post/14114626
If the rule is about forwarding traffic from the lan interface to the wan interface, then why is there also a forward rule? How would inputs, and outputs make any sense if the rule is talking about forwarding? What does it mean for wan to forward to REJECT? I interperet that as saying that wan doesn’t go anywhere, but that wouldn’t make sense given that the router can send, and receive over the internet.
For example I would interperet the first rule as follows:
lan => wan: the conditions for which connections from thelaninterface are forwarded to to thewaninterface.Input: accept: thelaninterface accepts all connections originating from the network (I wouldn’t understand the point of setting this to bereject).Output: accept: all connections exiting thewaninterface are accepted (again, I’m not sure what the point of this would be).Forward: accept: forwarding of packets fromlantowanis allowed.- Masquerade: I honestly don’t know what the effect of enabling this would be. What would it mean to masquerade the
laninterface?
I tried finding documentation, and I did come across this, and this, but, from what I could understand, they didn’t really answer any of my questions.
For the most part, it has been answered (you can scroll through the comments to see if you want to add any other information to a reply of mine, or someone else), but I would still certainly appreciate other attempts at explanations.