airportNetwork
I just bought an AirPort extreme (bought December '12). I'm trying to assign a static IP for my printer.
With Airport Utility 6.2, under Network, I click on the plus sign under DHCP Reservations. All I get is a beep and it doesn't do anything.
Router mode is set to DHCP and NAT.
What is preventing me from adding a DHCP Reservation?
The DHCP works fine for the airport.
If you use ethernet and a static IP address, then you'll have to choose an IP address outside of the DHCP lease range otherwise you can get IP address conflicts.
For example, if your DHCP range is set to 192.168.0.10 through 192.168.0.20 then you can use the IP address ranges 192.168.0.1 - 192.168.0.9 and 192.168.0.21 - 192.168.0.253 for statically assigned IP address.
Hope this helps
What you could try is set the DHCP range to start at +1 and manually set the IPs on your server. For example, set the DHCP range to be 10.0.1.3 to 10.0.1.200. The 10.0.1.2 IP will be free to be used by your server. In AirPort Utility for me this is at Network > Network Options.
Best Answer
Download Airport Utility 5.6. This older version of Airport Utility will let you make DHCP Reservations. (I had to resort to this because Airport Utility 6.2 ignored the plus sign under DHCP Reservations. It also ignored the Edit button and needed a "Force Quit" to terminate.)