Well the camera is working, on the external network as you described. Very glad that it is working (thank you!), but frustrated at the same time that we couldn't get it working on the internal network.... and now I've got to go out an buy another wireless access point also.
I am curious as to why you suggested 192.168.4.X. for my home network? Is this based on the DNS1 address I found in web admin? What does that have to do with my home network? Not having a go at you, I am genuinely curious!
My Netgear router admin page is accessed via 192.168.1.1, so I put this in for both gateway and DNS - is that the wrong way to do it? Whilst it is working now, I don't want it to be unreliable because I messed up the settings! Subnet 18.104.22.168 as per usual and the actual IP 192.168.1.X.