Airport Extreme Base Station and DSL modem, IP address Conflict issues

Jmiller1138, Welcome to the discussion area!

It sounds like you either you have your DSL modem connected to one of the LAN ports on the AirPort Extreme base station (AEBS) OR you have the AEBS configured to operate as a bridge.

So first verify that the DSL modem is connected to the AEBS's WAN port.

Second configure the AEBS so that it is "sharing a single IP address". Also ensure that both your PC and MacBook are using DHCP to get an IP address from the AEBS.

The double NAT is a warning. In your case you need to ignore that warning.

Duane,

Please forgive the inquiry, but I have exactly this problem. My Actiontec DSL modem causes a "Double NAT" error in my AEBS. The odd thing is that everything seems to be working. All the Macs in my home get internet access. I have the follwoing configuration:

- Actiontec M1000 DSL modem to Wan Port of
- AEBS 1 (802.11) Set to create wireless network, allow for extended network
- AEBS 2 and 3 (802.11) as remote extenders, both to extend WiFi and for ethernet ports for gaming and internet ready AV stuff.
- Mac Pro via Ethernet cable to AEBS 1
- Multiple iMacs/Macbook Pros connecting via wifi

You advised here that this gentleman just ignore his warning. Why is that okay? Is it just some false alarm, or does it have any effect on the speed or stability of the network/internet connection?

Any clarification would be greatly appreciated!

All,

I recently posted what I believe to be a similar/identical issue. See my post here: http://discussions.apple.com/thread.jspa?threadID=1378849

I have not changed my AEBS to "Off (Bridge Mode)" yet, because everything currently 'works' but I continue to get the occasional "Double NAT" warning suggesting I switch the AEBS to bridge mode. When this happens, I lose connection to the internet and need to unplugged both the AEBS and my modem to re-establish a connection to the internet and the external HD I have connected to the AEBS.

My question for Jmiller1138, do you continue to get the "Double NAT" warning even when you changed your AEBS to "Off (Bridge Mode)"? I am hesitant to change my AEBS to bridge mode since I'm assuming I'll need to totally reconfigure my entire network (meaning both the AirPort Extremes, my wireless HP printer, and my firewalls on my PCs).

The ignoring of the warning (i.e. closing the AirPort Utility without updating the AEBS) is what triggers the need to reset my AEBS and modem. Not fun.

I guess I'll just need to bite the bullet and set the AEBS to bridge mode . . . yes?