Right. Terry, I think you have
     Visitors — Pi — ISP-router — Internet

since you said the Pi has two Ethernet interfaces.  nodogsplash is
`listening' on the Pi's left side to decide what to do with incoming
packets from Visitors.  It is the `Gateway' from the Visitors'
perspective.

Its `GatewayInterface' parameter must be set by you and is an interface
name, e.g. one of those output by `ip a'.  The `GatewayAddress'
parameter you point out says `Default: Discovered from GatewayInterface'
so there should be no need to explicitly set it.

I think nodogsplash does all its work with iptables(8), and these can be
listed once nodog' has done its work if you want to understand what it's
done, and to do the same rules yourself so nodog' isn't required.

Cheers, Ralph.

Just seen all this and wonder whether IPCop might be  a solution, if it is still available. It could separate the visitors from the rest of the network.  Who knows, it might even run on a Pi, though I think you are looking at three Ethernet ports with this as a solution.

Peter M.


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