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DHCP
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Stands for Dynamic Host Configuration Protocol (DHCP)
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What is an IP address?
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Internal "private" IP addresses vs public addresses
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If you have a home LAN and router then the router typically assigned the IP address and manages the leases
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If there is a problem with that management and devices end up with the same IP then the network can be effected
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Static IP addresses
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Set in the client.
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Trouble that with Macs, you would need to set up "locations" if you move between private networks
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DHCP Reservation
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A way to assign the same IP address to the same computer of devices from the DHCP server (router)
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Supported by Airport Express, Macs and iOS devices. Also many 3rd party routers.
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Finding a client id
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You will use either the DHCP Client ID or the MAC address to assign the DHCP reservation on your router
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DHCP Client ID
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On Mac, System Preferences-->Network-->choose interface (Ethernet, AirPort, etc.)
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Click the 'Advanced…' button
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When set to 'Configure Using DHCP' in the TCP/IP tab there is a box for DHCP Client ID
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Set the ID to whatever you want, but remember it for later
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On iOS
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Settings-->General-->Network-->Select the network
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Under 'DHCP' add a 'Client ID'
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MAC Address
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Media Access Control address.
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A number consisting of six groups of two hexadecimal digits separated by a colons
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For ANY network device, or more specifically interface. Not just an Apple thing.
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On the Mac
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System Preferences-->Network-->Select the Interface
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Click on the 'Ethernet' tab
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Note the Ethernet ID
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Can also find it in the System Profiler under 'Network'-->'Locations' and looking for the 'MAC Address' value for each interface.
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On iOS
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Settings-->General-->About
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Note the 'Wi-Fi Address'
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Make the reservation
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Specific instructions will vary slightly based on your network setting and router
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I use an AirPort extreme and private IPS in the 10.0.0.0 range. 192.168.0.0 and 172.16.0.0 are also possible
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In the Airport Utility
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Select the Airport and click the "Manual Setup" button
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Select the 'Internet' section
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Then click on the 'DHCP' tab
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Setting the DHCP address range (optional)
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I do this to leave part of the range open for static IPs
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You can also check your DHCP lease time here
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Section for DHCP Reservations
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Click the "+" button
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In the 'Description' enter anything you'd like to remember the reservation
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Reserve by, choose MAC Address or DHCP Client ID
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Then enter the MAC Address or Client ID depending
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Set the desired IP address. Preferably outside the range of already DHCP assigned addresses on your network, but still in the DHCP range.
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Click 'Done' and then Update to reset the Airport
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You may need to reset the device or renew the DHCp lease for it to take effect on the client.
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From this point forward on your network it should always assign that IP address to that device.
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