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Internet, Networking, and Wireless
Airport Extreme making new IP addresses everytime
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<blockquote data-quote="postman56" data-source="post: 1321691" data-attributes="member: 221748"><p>Hi guys, I found this article, how to I go about doing this, it would appear to be the exact problem and the solution</p><p></p><p></p><p></p><p>Apparently, the Apple engineers who implemented the DHCP reservation feature in the new (draft) 802.11n Airport Extreme base station are fans of this episode.</p><p></p><p>Features like port mapping make it necessary for a computer behind a home router to have a static IP address rather than one that is randomly assigned by a DHCP server. The older Airport base stations didn't support this, which meant manual configuration hassles. But the new one allows the user to set up DHCP reservations, so that the same computer always gets the same IP address from the built-in DHCP server.</p><p></p><p>The reservation part works fine: whenever the computer in question requests an address, it gets the reserved one. However, just like the car rental agent in the Seinfeld episode, the Airport Extreme doesn't hold reservations. So it's possible for another computer to get the reserved address first. In this case, it's possible for two computers to get the same IP address, which leaves the second (or possibly both) without working connectivity.</p><p></p><p>The workaround is simple: just make sure the reserved address is either below the DHCP beginning address or above the DHCP ending address. The obvious choice is the latter: the addresses ending in 201 to 254 fall within the address block served by the Airport Extreme, but outside the range of addresses that DHCP gives out without a reservation. The Airport Utility lets you use the address 1, even though that won't work because it's the address of the Airport Extreme itself.</p></blockquote><p></p>
[QUOTE="postman56, post: 1321691, member: 221748"] Hi guys, I found this article, how to I go about doing this, it would appear to be the exact problem and the solution Apparently, the Apple engineers who implemented the DHCP reservation feature in the new (draft) 802.11n Airport Extreme base station are fans of this episode. Features like port mapping make it necessary for a computer behind a home router to have a static IP address rather than one that is randomly assigned by a DHCP server. The older Airport base stations didn't support this, which meant manual configuration hassles. But the new one allows the user to set up DHCP reservations, so that the same computer always gets the same IP address from the built-in DHCP server. The reservation part works fine: whenever the computer in question requests an address, it gets the reserved one. However, just like the car rental agent in the Seinfeld episode, the Airport Extreme doesn't hold reservations. So it's possible for another computer to get the reserved address first. In this case, it's possible for two computers to get the same IP address, which leaves the second (or possibly both) without working connectivity. The workaround is simple: just make sure the reserved address is either below the DHCP beginning address or above the DHCP ending address. The obvious choice is the latter: the addresses ending in 201 to 254 fall within the address block served by the Airport Extreme, but outside the range of addresses that DHCP gives out without a reservation. The Airport Utility lets you use the address 1, even though that won't work because it's the address of the Airport Extreme itself. [/QUOTE]
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Airport Extreme making new IP addresses everytime
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