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Why am I getting a Double Nat message from my Airport Extreme?

The.316

The.316

macrumors 65816
Original poster
Jul 14, 2010
1,406
186
25100 GR
I have an Airport Extreme connected to my Netgear modem, and I get a Double Nat message from time to time in my Airport Utility app. I have to restart my modem and my Airport Extreme in order to get the message back to normal. Is there something that I am doing wrong?
 
You haven't given us enough info - is your modem actually a modem/router? Have you left the typical NAT/DHCP server services running on both modem and A/Extreme?
 
gsahli said:
You haven't given us enough info - is your modem actually a modem/router? Have you left the typical NAT/DHCP server services running on both modem and A/Extreme?
Click to expand...

The Netgear is just a modem, connected to my Airport via an ethernet cable. I dont really know what to setup, or how to, to be honest. I eventually want to connect an external HD to my Airport extreme, but as of right now, I have my PS3, Apple TV, iMac, MBP, iPad, HP printer and iPhone connected to it, wirelessly. I havent set anything up on the Netgear modem either. Should I be doing something different?

This is what I get from my Netgear page:
 

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Not if the Apple is detecting double NAT. Your netgear is a router. You need to disable the firewall/nat on it and allow the Apple to control that.
 
gsahli said:
What model Netgear (so we can look up the manual)?
Click to expand...

DM111p is the model, V2.00.27_WW is the firmware version.

Now here is another thing, when I changed the Airport Extreme to bridge in Connection sharing, rather than sharing a public IP address, my iMac wont connect.

The modem is strictly a modem, so Im thinking that I need to play with the settings in Airport Utility, no?
 
Delete; I thought his modem was also a router (it isn't)
 
Last edited:
You need to setup the Netgear in bridge mode and not the Apple one. I will say this again. The Apple needs to control your DHCP and network NAT.
 
nizmoz said:
Not if the Apple is detecting double NAT. Your netgear is a router. You need to disable the firewall/nat on it and allow the Apple to control that.
Click to expand...

nizmoz said:
You need to setup the Netgear in bridge mode and not the Apple one. I will say this again. The Apple needs to control your DHCP and network NAT.
Click to expand...

I read what you said above, but I notice that there isnt an area on the Netgear site that allows me to disable the firewall/nat. I am going to read the links that you sent me, and see what they are about. Thanks for the help!
 
Same error with 2TB TC and Moto 6120 cable modem

The Moto 6120 is set as DHCP server and configuration is controlled by COMCAST. Connection is by ethernet.

AP router is set to share public IP and asked if I want to share a set of IPs or bridge mode. If I set it to bridge will I lose the NAT?

Any recommended configuration would be great.
 
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