Set NAT's Default Host based on client ID, not IP

Hello,
Is there a way to set the NAT's default host to a "Client ID" instead of an internal IP address? I need this because often my PC's IP change and I need to update it manually in the Airport, causing it to restart and breaking all internet in my house.
What happened to "it just works" ?

Hi!
In Airport Utility you have to go to Network tab. There you can add a DHCP reserve for your computer based on it's MAC adress. This way your computer will be always in the same IP.

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