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Apple AirPort cannot get IP address from cable modem using DHCP

I just switched from DSL to Time Warner cable modem service. I can connect my MacBook Pro directly to the modem and get a valid IP address just fine using DHCP. But when I connect my Apple aiport base station to the modem, I cannot get an IP address from the modem. I can talk to my base station just fine from the MacBook, the problem seems to be between the base station and the modem. I am connecting from the airport to the modem using ethernet, not PPPoE - I did not have to use PPPoE to connect my MacBook to the modem, so I assumed I didn't need it to connect from the airport to the modem. I already called Time Warner about this and they can see my modem talking to the airport. Because I can connect my MacBook directly without a problem, they of course say it is not their problem.... Any suggestions? I have turned the various pieces of equipment off an on about 50 times already - no help....

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  • Frank  Fernandez
    Frank Fernandez May 11, 2010

    You can power down & up the components 100 times and if not in the correct order no positive results should be expected. If you have powered down the modem, router, and PC then powered up the modem then 20 seconds or more later the router and then the PC and still no luck then you have my sympathy.

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Go to applications,utilities and go to airport set up and check the settings, it could need the DHCP setting up or the old settings deleted

Posted on Aug 13, 2009

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How did you connect the computer to the router. If you are using a DSL modem it will have a DHCP server in it that is allocating IP addresses across your network. If you added the router to the computer via a hub or network switch what is the computers ip .
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. How do you do this by ethernet connection from only the desktop directly with only the Wi FI . router. Go to a internet browser and type in the URL 192.168.0.1 and then change the router ip address to match what the DSL modem DHCP issues..
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How to obtain public IP from Time Warner


<p>There are two basic types of IP addresses of internet service providers (ISPs) to provide customers with Internet services: a dynamic address or DHCP and a static IP address. A static IP, as the name implies, uses the exact same IP, and you're online all the time. The DHCP IP configuration uses a "stack" of available IP addresses each time a modem is online and an IP address of the network of the ISPs is simply grabs the first available IP address from the stack. The IP configuration of DHCP, then it is very easy for a new public IP address from your provider at any time <br /> <p><br /> <p>1. Unplug the cable modem from Time Warner. Total count of 30 seconds and close. <br /> <p><br /> <p>2. Allow the modem to reboot every five minutes. During this time, goes through the boot cycle, contact your provider and ask for a dynamic IP address. <br /> <p><br /> <p>3. Navigate to the computer's IP Configuration Manager. For most versions of Windows, the easiest way to do this is to open the Start menu, click All Programs, then select "Command Prompt" from the "Accessories" menu (for future versions of Windows, you may need to the right button on the Command Prompt and select Run as Administrator "to show itself sufficient permissions on IP of the computer information). <br /> <p><br /> <p>4. IP address to test your computer by typing "ipconfig" and "Enter" Command to the numbers printed next to "IP address", like "IPv4 or IPv6 address." The number displayed on the public IP address of the DHCP as the modem from Time Warner will receive net. <br />

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Here is how it works:

A router connects two separate networks and manage the traffic between them.

In most home network applications the router connects your local group of computers and devices known as the LAN with the Internet, commonly called the WAN or Wide Area Network.

The router usually assigns unique Local IP addresses to all of the devices connected to it via a service known as DHCP. The addresses assigned by your router are private addresses http://en.wikipedia.org/wiki/Private_net... and are not routable across the Internet.

Dynamic Host Configuration Protocol (DHCP) is an auto configuration protocol used on IP networks. Computers that are connected to IP networks must be configured before they can communicate with other computers on the network. DHCP allows a computer to be configured automatically, eliminating the need for intervention by a network administrator. It also provides a central database for keeping track of computers that have been connected to the network. This prevents two computers from accidentally being configured with the same IP address. http://en.wikipedia.org/wiki/Dynamic_Hos...

Your cable or DSL modem will get a Public WAN IP address from your ISP's DHCP service. These public IP addresses are leased in blocks by your ISP and are Internet routeble. The modem is connected to the WAN port on your router. The router will manage the traffic between the devices on the LAN and the Internet.

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