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AirPort IP Address Limit

5861 Views 11 Replies Latest reply: Apr 13, 2012 9:56 AM by Bob Timmons RSS
angeloe Calculating status...
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Apr 12, 2012 6:43 PM

I would like to know what is the maximum number of IPs that AirPort Express built in DHCP can provide?

  • Bob Timmons Level 9 Level 9 (75,675 points)
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    Apr 12, 2012 6:58 PM (in response to angeloe)

    When the AirPort Express is configured as a wireless router, it will allow up to 10 devices to connect.

  • pointm Level 1 Level 1 (20 points)
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    Apr 13, 2012 2:47 AM (in response to Bob Timmons)

    Good question on IPs, Bob, how about private ip behind the Airport Extreme? According to my findings, Airport Extreme only handles block A, B and C ranges of IPs. How am I going to have a server (Lion for example) behind it with one of my private IP block that start with 50.73.xx.xx? Can't figure it out, and when I do, it says that I have a double NAT and interner doesn't work? Need help.

    Thinking on returning it if I can't find a solution.

  • Bob Timmons Level 9 Level 9 (75,675 points)
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    Apr 13, 2012 8:03 AM (in response to pointm)

    When acting as a DHCP and NAT router, the AirPort Extreme will only provide private IP addresses in the 192.168.x.x, 172.16.x.x, or 10.0.x.x ranges.

     

    Sorry, I have not used Lion server or another similar server so can't comment on that issue. You might want to look at the DHCP Router Mode to see if that would do what you want.

  • Tesserax Level 8 Level 8 (47,585 points)
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    Apr 13, 2012 8:08 AM (in response to angeloe)

    The DHCP server sevice on the AirPorts will provide Private IP addresses in the range of n.n.n.2 through n.n.n.254, but as Bob has mentioned your AirPort Express will be limited to the number wireless clients that can connect to it. Also, for Private IPs, you should not use .0 or .255 as these are reserved. In addition, the base station itself will use .1

  • Bob Timmons Level 9 Level 9 (75,675 points)
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    Apr 13, 2012 8:15 AM (in response to angeloe)

    You are limited to the 10 wireless connections per AirPort Express, regardless of the number of IP addresses that the "main" router might be set to deliver to network devices.

     

    For example, an AirPort Exteme acting as a main router could deliver IP addresses from say 10.0.1.2 to 10.0.1.253 for the network. But, only 10 IP addresses will be allowed per AirPort Express device, since that it is limit of wireless connections that the AirPort Express will allow.

  • Tesserax Level 8 Level 8 (47,585 points)
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    Apr 13, 2012 8:14 AM (in response to pointm)

    Using a server behind a NAT router to issue a Private IP address range that is different than that router would require either an additional NAT service or a network router that supports VLANs. Unfortunately, the AirPorts do not have VLAN functionality (beyond the Guest network feature.)

     

    BTW. A "double NAT" condition is not necessarily bad. All network clients connected to either network segment would still be able to access the Internet, just not clients on different segments.

  • Tesserax Level 8 Level 8 (47,585 points)
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    Apr 13, 2012 8:18 AM (in response to angeloe)

    If you set the range to 50 IPs, the first ten wireless clients will get an IP address somewhere within that 50 addressess.

     

    With ten client already connected, if you assign an eleventh client a static Private IP address outside of that range, it should not be able to connect. However, I have seen cases where the ten client limit has been superceeded.

  • Bob Timmons Level 9 Level 9 (75,675 points)
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    Apr 13, 2012 9:56 AM (in response to angeloe)

    I guess the the AirPort Extreme would solve my problem but still limited to 50 clients. Am I right?

    Correct, it is 50 wireless clients on the AirPort Extreme. Adding a second AirPort Extreme would allow up to another 50 wireless clients, etc. You could also connect Ethernet devices, as well to the AirPort Extreme(s).

     

    The total number of connected devices (Ethernet and wireless) could be about 250 or so.

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