I would really like RobWray's (or anyone else's help) with my Airport setup involving multiple Airports including one for which I needed to use the Bridge Mode because of the length of the Ethernet cable. I had done this successfully one time, but I had to swap out Airport devices including using a different Airport as my Main Airport Base Station (i.e., modem-attached) and can't successfully replicate what I had done with the Airport for the distant location ("Pluto"). Everything else on the newly configured network is working fine.
In addition, it MAY be relevant that my cable modem has changed (awhile ago) to one with 2 IP addresses, one of which it assigns to my Main Airport Base Station (i.e., locally 10.0.1.1). That has been working fine also.
At any event, I have gone as far as physically resetting the Airport that I want to use as a (bridged) base station ("Pluto") but at this point I can't even get the Airport Utility (Yosemite; v. 6.3.5) to recognize it as a "new wi-fi device." But let's say I get beyond that--if I can't I'll just buy a new Airport: the same "bridging" problem will still be with me.
What I need to have reviewed for me is how I set up the "Pluto" Airport as a bridged network. For example, do I set the Main Airport as running as a Bridge or as DHCP and NAT? The latter is how I have it set up now. When I program "Pluto" I presume I select "Create a Wireless Network" and then under the Network tab, select "Off (Bridge Mode)." Do I put anything in under DHCP Reservations? or anything else on the Network tab? I have tried this once with no luck.
I have tried setting up "Pluto" through wi-fi, as suggested; and also through Ethernet.
Hoping someone here can help me. My email is hjbecker@uci.edu if that would work for you as well.