I am looking to replace an existing wireless network, and because of the ease of extending the network with multiple access points, I am looking at using a combination of Apple Airport routers. The only twist that I see is that I need to have multiple secured networks. The requirements are: Primary "internal" network for about 25-30 wireless connections. Primary "guest" network for up to 100 wireless connections. Secondary "internal" network for about 5 wireless connections. All routers/connections will be located in a single building of approximately 5,000 sf with limited number of walls and other hindrances. We can connect the various wifi routers via Ethernet to allow for better throughput. I know that the Apple routers will allow both "primary" and "guest" networks, but not sure how to implement the secondary internal network. And I am concerned about getting around the potential double-NAT issues. Does anyone have any experience with this kind of configuration?