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AirPort Extreme 802.11n as a wireless router and local network switch?

Update:10-11Source: network consolidation
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Good afternoon,
I'm curious if its possible to have the APE in wireless network mode and connect systems via hard line as well?
I have an AirPort Extreme 802.11n set to "Create a Wireless Network" mode that is attached directly to a cable modem for internet connectevity. My issue is that while all wireless devices (several iPods, two iPhones and three laptop computers) connect to the APE without issue (and have internet access), when I try to plug in a Windows 7 desktop computer via one of the ethernet jacks, Windows is unable to connect and shows the network as "unidentified," spitting back a private IP address as opposed to a local LAN (this behavior repeats for an Ubuntu Linux box as well).
Not sure if the APE is misconfigured, this is a Windows 7 issue or if its improper use on my part (though this also precludes me from connecting a gigabit switch to the APE).
Thank you,
Nathan

The Best Answer

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Properly configured, the AirPort should provide both wired and wireless network client with Internet access.
At this point, I would recommend that you do the following as a minimum:
Power-down the modem, AirPort base station, and computer(s).
Power-up the modem; wait at least 10-15 minutes to allow it adequate time to initialize.
Power-up the AirPort base station; wait at least 5-10 minutes. Note: The AirPort's status light may continue to flash amber after it has intialized. That is because, there may be some additional configuration items necessary, like setting up wireless security, before the overall setup is completed to get a green status.
Power-up your computer(s).
If the above steps do not solve the problem, start over with step 1 above, but then perform the next steps between steps 1 & 2. above.
Disconnect the AirPort base station from the Internet broadband modem.
While all of the devices are powered-down, perform a "factory default" reset on the base station. This will get it back to its "out-of-the-box" configuration and make setting it up much easier, especially if you use the "Assist me" process within the AirPort Utility. (ref: Resetting an AirPort Base Station or Time Capsule)
After the base station resets, go ahead and power it back down.
Reconnect the AirPort base station to the Internet broadband modem. For the Extreme and Time Capsule, be sure to connect the cable to the base station's WAN (circle-of-dots) port.
Continue with step 2 in the first set of steps.
In this basic configuration, the AirPort base station will broadcast an unsecured wireless network with a Network Name (SSID) of Apple Network NNNNNN. Network clients, connected to the base station either by wire or wireless, should now be able to access the Internet through the ISP's modem. Once Internet connectivity has been verified, you can use the AirPort Utility to configure the base station for wireless security and any other desired options. Please post back your results.