Airport Extreme invalid IP address, no DNS server

Hardware: Motorola SURFboard SB6141, Airport Extreme A1408
I recently set up a new internet service with Cox, plugged in the SB6141 and A1408 and everything set up perfectly, solid green light and wireless was flawless. However, electricity to my house had to be reset, and when the power came back on the green light on the Airport Extreme started to flashing amber. I did several hard/factory resets of the Airport Extreme as well as unplugging the modem and leaving everything unplugged for several minutes and then plugging everything back in. No matter what combination of things I try to do, the Airport Utility always tells me the same 2 errors: invalid IP address and no DNS server. Why was the Airport Extreme able to automatically set up the first time, but not now? Any ideas of what I can do? Thanks!

I have also looked through other threads about this same problem, but none of the solutions (e.g. posts by Tesserax, followed to the letter) so far have worked.
Here are other things I have tried:
1. Called Cox to have them reset my modem, internet works through Ethernet directly from the modem
2. Downgraded AEBS firmware to 7.6.1 (oddly enough, now I cannot for the life of me update the firmware back to 7.6.4, always says cannot connect to update server)
I ran through the various solutions from this thread: "No DNS servers" and "Internet connection" problems with Comcast?
Still getting that pesky blinking amber light.

Similar Messages

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    My internet has been working fine since initially configuring the router and modem but the other night the internet simply stopped.
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    There is a bad bug with some Motorola modems with the ethernet on the WAN port.
    It is simply not connecting properly. What modem is it??
    It is not uniform.. but it happens to a large enough number of people that there is a fair number of threads about modem issues and the newer airports.
    Please do a search yourself here for experience with your particular model.
    But you have blotted out the very info I need to help you.
    I need to see IP address and DNS.. if you are on dynamic IP it makes no difference to post it.. you will have a new IP tomorrow.
    I have suggested a work around in using a crossover cable or a small 10/100 switch between the modem and the airport.. it helps for some.
    There is also some more info you can get using the natutil command from terminal.. particularly it will show the WAN link speed.. which I want to force down to 100mbit.
    Terminal command to check Apple router status. natutil
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  • Airport extreme stopped conneting asking for dns server?

    my internet connection sopped out of nowhere and in airport utility it's asking for the dns server(s) numbers which 2 spaces are blank...

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    Power-up the modem; wait at least 10-15 minutes.
    Power-up the base station; wait at least 5-10 minutes.
    Power-up your computer(s).
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  • Airport Extreme No IP Address

    Airport Extreme No IP Address & Self Assigned IP Address Issue, RESOLVED:
    Re: Airport Extreme IP Address Issue
    After hours of trying everything else, this worked!!!
    From: Comcast Networking/Router/Wifi Gateway:
    Re: Airport Extreme IP Address Issue
    11-20-2012 07:11 PM
    MyComputerGuyJo:
    I just wanted to add what Apple Support walked me through. Worked perfectly. Similar to some of the posts here. This assumes you have finished the setup of the Airport using DHCP to obtain the IP automatically from Comcast and it says the IP is invalid.
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    1, Power off Comcast Modem. Remove Battery back up, if it has one. Disconnect the coax cable.
    2. Power off Airport Extreme
    3. Let both sit for 3 minutes.
    4. Reconnect coax cable to Comcast modem and replace battery and power up.
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    (When AP asks for DNS, Type in both addresses below)
    Re: Airport Extreme IP Address Issue
    11-01-2012 03:07 PM
    Freyfisher: I had the same problem whenn I switched to the Airport Extreme yesterday.  Here is what I did:
    1:  uplugged modem for 30 sec. and detached all ethernet cables.  Plugged back in and reattached airport extreme cable after all lights were solid on the modem. Then, I went into Airport Utility and selected, "Base Station"> "restore default settings".  Then" Base Station"> Restart.  Then go through setup assistant again. If no luck, try setting IPv4 to 10.0.1.2, subnet to 255.255.255.0, router to 10.0.1.1. IPv6 set to OFF if having trouble.  DNS adresses: 75.75.75.75, 75.75.76.76, search domain hsd1.ST.comcast.net where "ST" is your two-letter State abbrev. Hope this helps someone....

    I have also looked through other threads about this same problem, but none of the solutions (e.g. posts by Tesserax, followed to the letter) so far have worked.
    Here are other things I have tried:
    1. Called Cox to have them reset my modem, internet works through Ethernet directly from the modem
    2. Downgraded AEBS firmware to 7.6.1 (oddly enough, now I cannot for the life of me update the firmware back to 7.6.4, always says cannot connect to update server)
    I ran through the various solutions from this thread: "No DNS servers" and "Internet connection" problems with Comcast?
    Still getting that pesky blinking amber light.

  • So my airport extreme recently had some nat/dns issue and in the airport utility displayed a warning about it and to correct it. I wasn't sure what to do so i pressed the resolve icon and now my guest network is not working.

    So my airport extreme recently had some nat/dns issue and in the airport utility displayed a warning about it and to correct it. I wasn't sure what to do so i pressed the resolve icon and now my guest network is not working.

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    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.
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    Question 1: Have you observed problems with Apple equipment getting high error rates over high latency connections such as satellite connections?
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    jone1101 wrote:
    I have had my airport extreme for over a year and comcast even longer than that. For some reason my airport now says it has a invalid ip address. I plugged my modem directly into my imac and the internet connection is fine. I have power cycled everything multiple times with the same result. I even reset my airport extreme and created a new network. Nothing is working please help!
    Does your cable modem have any sort of battery backup that would prevent it from resetting fully during a power cycle?

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    cdated, Welcome to the discussion area!
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    Message was edited by: openarchitecture

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