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AirPort Express DHCP Server for distribution of IP-addresses?

8484 Views 12 Replies Latest reply: Dec 28, 2010 5:36 PM by Bob Timmons RSS
deadringer971 Calculating status...
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Sep 24, 2010 5:01 AM
Does the AirPort Express have an DHCP server that distribute local IP-addresses like other Wi-FI router does? If so, how do I set it up in the AirPort Utillity?
Mac Pro, Mac OS X (10.6.4), MacBook Pro, iPhone, iPad, Mac Mini, iMac
  • William Boyd, Jr. Level 6 Level 6 (10,475 points)
    deadringer971 wrote:
    Does the AirPort Express have an DHCP server that distribute local IP-addresses like other Wi-FI router does?


    Welcome to Apple's discussion groups.

    Yes.

    If so, how do I set it up in the AirPort Utillity?


    In the Internet panel, Internet Connection tab, set "Connection Sharing" to "Share a public IP address".
    MacBook 2.0 GHz, Mac OS X (10.6.4)
  • Philbyfish Calculating status...
    Can the airport only present a range of IP address that are provided by another router?

    I just want it to provide 10 IP addresses from the range being provided by the Netcomm router.
    G5 Dual 2.5, Powerbook G4, Mac Mini, Cube, G3 iMac, Mac OS X (10.5.7)
  • Bob Timmons Level 9 Level 9 (75,435 points)
    +I just want it to provide 10 IP addresses from the range being provided by the Netcomm router+

    This may one of the cases where you would use the +Distribute a Range of IP Addresses+ setting under Connection Sharing in AirPort Utility.

    AirPort Utility > Manual Setup > Internet icon

    Connection Sharing = Distribute a range of IP addresses

    Click the DHCP tab to specify the range of beginning and ending IP addresses. The "rub" here is that you will only be able to use addresses in the following ranges:

    10.0.x.x, 192.168.x.x, and 172.16.x.x
    MacBook Pro, iMac, Mac OS X (10.6.4), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • Philbyfish Level 1 Level 1 (10 points)
    Thanks,

    A point of clarification. The Airport is connected via Ethernet to the wired house network through which all devices including the Airport get their IP address from the Netcomm Router/modem. The airport is a wireless extension of the wired network.

    Make sense?

    I have set this up as suggested however the wireless devices that use the Airport Express for internet access are all assigned an IP address (the first available?) at the beginning of the range and well outside the range specified in the DHCP tab.

    Seems I cant force it to only use a specific subset of the IP address range?
    G5 Dual 2.5, Powerbook G4, Mac Mini, Cube, G3 iMac, Mac OS X (10.6.4)
  • Bob Timmons Level 9 Level 9 (75,435 points)
    +Seems I cant force it to only use a specific subset of the IP address range?+

    That would be up to the Netcomm router to provide the IP addresses to be used. I'm not familiar with Netcom, but a router with the type of capability I was thinking of could be configured to provide a certain range of IP addresses to a given device based on the MAC address of the device.

    The additional information that you just furnished indicates that you probably have a basic featured router designed for home network use that would not have this type of capability. In that case, the AirPort Express would not be able to be configured to Distribute a Range of IP Addresses. It would have to be configured as a "bridge" on the network and receive IP addresses from the main router.

    Or, the AirPort Express might be able to distribute the IP addresses that you want if you configure it to Share a public IP address. The rub here is that you will have what is known as a Double NAT on your network. You'll have two devices handling DHCP on the network when there should only really be one. It may or may not function correctly as this is not a recommended configuration.

    Message was edited by: Bob Timmons
    MacBook Pro, iMac, Mac OS X (10.6.4), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • BlStoll Calculating status...
    Bob Ive been reading your posts on this thread and they have been pertaining to the problem I am currently having with seemingly the same setup.

    I have a similar basic router setup with my airport express. It has been running fine on what I believe you describe to be this double NAT setup.

    Suddenly my airport says it does not have a valid IP address. My other devices like Iphone and PS3 cannot obtain a valid IP address either. The only way I can connect my computer to the internet is if I put the airport in bridge mode.

    If I set it to share a public IP address or to distribute a range of IP address it can not do so at all.

    Any suggestions?
    I never sign up on forums but, but I think you could help! Thanks in advance
    MacBook Pro, ItsNice
  • Bob Timmons Level 9 Level 9 (75,435 points)
    The first thing to try when you have issues on a network is a complete power cycle. Power everything off, order is not important.

    Then start the modem first and let it run a moment. Then start the next device the same way, etc until you have everything powered back up.

    The Double NAT is an "iffy" deal. After all, it is technically against the rules. It may work on some networks and not on others. Or it may work some of the time on a given network, but not all of the time.

    All I can suggest is that you consider resetting the AirPort Express back to factory defaults and try again.
    MacBook Pro, iMac, Mac OS X (10.6.5), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • BlStoll Level 1 Level 1 (0 points)
    Ive attempted to restart everything and still nothing. My airport has been running the same setting for years and suddenly I can not get it to work unless in bridge mode.

    I need to connect my other devices to my network. They can not do so until they obtain an IP address which my airport is failing to provide.
    My computer connects to the internet in bridge mode but nothing else. Technically I do not know why.

    Any advise..?
    MacBook Pro, ItsNice
  • Bob Timmons Level 9 Level 9 (75,435 points)
    Did you reset the AirPort Express back to factory default settings and reconfigure it as I suggested?
    MacBook Pro, iMac, Mac OS X (10.6.5), Time Capsule, AirPort Extreme, AirPort Express, iPhone
  • SeaWied Calculating status...
    I stumbled upon this thread as I'm trying to set up an old imac laying around the house as a home server...

    I have my combined modem/router handling all NAT and DHCP duties and the airport extreme base station operating in bridge mode. What I would prefer is to shift those duties to the AEB and turn them off on the modem/router.

    Despite the fact that my router allows me to turn those services off, I've been unable to get the AEB to function (i.e., obtain an IP address from the modem) in anything other than bridged mode. Any suggestions?
    Mac OS X (10.6.5)
  • Bob Timmons Level 9 Level 9 (75,435 points)
    It sounds like you have a gateway, which is a combination modem/router. It's difficult on most devices like this to configure them as a simple modem and just not possible on a number of products.

    What is the make and model number of your gateway? If things are working OK now with the AirPort Extreme in bridge mode, I'm not sure what you hope to gain by making it the "main" router. Can you clarify on that?
    MacBook Pro, iMac, Mac OS X (10.6.5), Time Capsule, AirPort Extreme, AirPort Express, iPhone

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