Why can't I have my guest network clients reach my LAN (non guest network) web server?

When a client comes onto the Guest-Network, they are presented with a Captive Portal (Default used in GL-iNet: NoDogSplash), and I've set up a forwarding address once they accept the terms.

That forwarding address is something like:

However, they can't access that server as it's on the non-guest-network. What do I need to do so that all guest can access my local website? I want to make sure that this is achievable with/without internet.


The whole concept of a guest network is about being separate from your LAN, disallowing access to LAN resources. If you want to change that, you'll need to explicitly configure it accordingly.