How to use Airport Extreme to create a second wireless network with different IP addresses behind an existing modem/router?

Hi,
I have an existing modem/router from my ISP that does DHCP and NAT with base IP 192.168.1.1 distributed in the wireless network. I use this wireless network for our private devices. I could turn off the DHCP server in this first router, but there isn't a separate setting to turn off NAT.
I want to connect my Airport Extreme (4th gen) to this existing router to create a separate wireless network for visiting guests, where IP addresses of 10.0.0.0 etc. are used. So I do not want to use the Airport Extreme in bridge mode, as I would like to keep the devices on the first network 'invisible' for those on the second network. (P.S. when connected in bridge mode, the Airport works well and can distribute a network with a different name from the first. It's just that I would feel more comfortable about our privacy if the Airport were to distribute a different IP range. False security, maybe?)
I've tried doing this by 'Sharing a public IP address' in Airport Utility's Internet tab, leaving TCP/IP's setting to 'via DHCP', setting DHCP addresses to start with 10.0.0.2 up to 200 with all else blank, and not using a standard host nor NAT-PMP in the NAT tab.
When I do this the Airport complains of a 'double NAT issue'. Internet connectivity seems to be OK, but when switching between the two networks on my Mac I get complaints about my IP address being in use by another device intermittently.
Can anyone help in how to get the 'double NAT issue' resolved?
Thanks!

So if someone is connected to the modem/router network they will be able to see the HD I will have put in to the AirPort Extreme?
As I said above.....since the modem/router and AirPort are bridged, devices on the modem/router wireless will be able to "see" devices on the AirPort wireless, and vice versa.....
If they can see the HD connected to the AirPort Extreme, will they be able to access it
Yes, unless you plan to password protect the drive connected to the AirPort Extreme.
or will they still need the password needed to get onto the AirPort Extreme network?
The modem/router and AirPort Extreme are bridged. They are on the same network. All devices are on the same network when the modem/router and AirPort are bridged. Not sure how else that I can say this.
Also, because it is bridged, I shouldn't have any problems accessing the HD I will have connected to the AirPort Extreme from an external location?
Accessing devices from a remote location is never easy....and a topic for a different post/discussion. If you have a "static" Internet IP address from your provider, and have all the details on how to forward ports on your modem/router, you are off to a good start.
Apparently there is some addressing issues because devices can be seen as "Double IP" because the modem/router would have allocated IP's as well as the AirPort allocating IP's thus making connections slower until resolved
When you "bridge", all IP addresses are issued by one device. There will be no conflicts on the network, since they are bridged.
Once again, in very simple terms, you have two doors (access points) that open into the same room (network).  One "door" is the modem/router and the other "door" is the AirPort Extreme. They are on the same network....("room") because they are bridged.

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    Running wires to this location is not an option.
    If the area has poor wireless connection.. when you locate the airport there it will not get much signal and so will give very poor signal.
    What you are asking to do.. will not help.
    Is there an option to wireless connect the Old Airport to the New Airport, but not extend the wireless network, while keeping the ethernet ports on the back active?
    No, there is no such option and it would not help anyway. The problem is the location of the airport is just very poor.
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    I thought I could repurpose an older (~5yrs) Airport Extreme for this purpose.
    What model is this exactly?
    Running what firmware?
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  • Using Airport Extreme Base Station As A Wireless Card?

    Hi,
    I don't know if this is even possible but here's what I'd like to do:
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    Ernest Lohrer wrote:
    Hi,
    I don't know if this is even possible but here's what I'd like to do:
    I've started to share an internet connection with a cousin of mine that lives in my apartment building. The connection is in her apartment and as far as I can tell the wireless signal is coming from the modem she has, there is no stand alone router/ base station.
    She has an "integrated" modem/router/access point.
    So far I've just been connecting using my iBook with the aiport card in it. No problems. I just had to get the ip number and password from her and I was hooked right up.
    Here's my real question:
    I also have a G4 Mini with no wireless card in it at all and an Airport Extreme base station from before we started sharing a connection. In the time that we've been sharing I haven't connected to the internet at all using the Mini. Now I'm wondering if there is a way I can hook the Airport Extreme to the Mini and somehow use it as a replacement for a wireless card in the Mini. Thus using the Mini connected to the Airport to connect just the Mini to the internet.
    I'm not worried about the iBook and do not wish to reconfigure the way I'm using/ connecting with it. Everything is peachy with that.
    If this is possible, how can I do it?
    Set up the AEBSn as a "bridge" and connect the G4 Mini to one of the "wired" internet connections.

  • Can I use an Airport extreme to extend my ATT wireless network?

    Hi
    I get my internet through an ATT DSL wireless router positioned up in my attic. I have a studio in my basement with 2 computers, a plotter, a laser printer and a fax/scanner/photo printer. I've run an ethernet cable down from the attic in to a central location in my basement. I've run ethernet cable from the three printers to that same location. I want to set up an unused Airport extreme base station in my studio to connect the plotter and two printers to my wireless network. One snag is that one of my computers has a bad airport card slot and needs to be connected to the network with an ethernet cable.
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    OK,
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