Setting up Airport Base Station with Uverse AND Sprint Airave I'm trying to configure my home network so that I can use a drive attached to my airport base station as the Time Machine drive. I think that to do this the Airport needs to control the DHCP and the NAT. I'm not sure I really understand DMZ settings, or if it's possible to push that to a third router...

Current setup includes:

ATT Uverse's 2Wire Modem/Router &gt; Sprint Airave  &gt; Apple Airport Extreme. 


Everything I've read about this doesn't seem to use three routers. I can connect to the internet, but not able to use Time Machine with my networked drive.

Is Double NAT error that big a deal?

Any thoughts? Any place to read layman's DMZ info? Anyone using a third router as the main DHCP server? Why does everything come with a router? Is my setup just too complicated?

Pre-AiRave, the Airport Base Station was the only thing connected to the ATT 2Wire, and it worked fine. Unfortunately, I sprint says the Airave must be in front of the router. The main concern is to get Time Machine working. That being said, Finder no longer sees the Airport Base station as a 'server' to connect to and simply access the networked drive. Am I barking up the wrong tree?



Airrave WAN Settings Screenshot
Airrave LAN Settings Screenshot
The definitive steps that worked for me. I would like to spell them out as much as possible, since many forum posts will say "Set this to that" but in no way tell you how to get to a setting screen.


Set Airport to use WPA2 security (not WPA/WPA2)

Airport Utility > Airport > Wireless > Wireless Security > WPA2 Personal
This may not work for everyone, especially if you have older devices

Set Airport to do DHCP and NAT

Airport Utility > Airport > Network > Router Mode > DHCP and NAT

Set Airport to reserve an IP for your AiRave/Airvana

Airport Utility > Airport > Network > "+" under "DHCP Reservations"
Choose a high number

Setup the Uverse Modem/Router

Turn off the wireless network

Settings > LAN > Wireless > Wireless Interface > Disabled

Verify your Apple Airport is the only thing using your Uverse Modem's Router

Settings > LAN > Status
Devices > Clear List
You want to only see one device.

Set Airport in the Uverse DMZ

Settings > LAN > IP Address Allocation

Firewall > Disabled
Address assignment > Public
WAN IP Mapping > Router WAN IP Address


Verify this worked

Settings > Firewall > Applications, Pinholes, DMZ
You should only see your Airport as the  'computer' in step 1.
Since it is selected, you see the radial button pressed for DMZ


Set up the Airvana/Airave

Manually set the IP to reserved

Advanced > LAN
(May not be necessary)

Set to use it's own MAC address

Settings > Status




Ultimately, I resolved the Airport/Uverse DMZ issue by switching the Airport Extreme from WPA/WPA2 to strictly WPA2. Initially, I didn't have much faith in this approach, but I tried it based on ouquinn's comment. This allowed me to set the Airport in the Uverse DMZ, which I had struggled for hours to do.