IT: Dynamic ip address and allow list

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How do dynamic IP addresses work with an allow list? If everytime your DHCP goes down and comes back up it assigns you a new IP, then would you have to change your allow list to allow the new IP?

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>How do dynamic IP addresses work with an allow list? If everytime your DHCP goes down and comes back up it assigns you a new IP, then would you have to change your allow list to allow the new IP?

An allow list is filled with **MAC** addresses – unique device identifiers -, not IPs.

Like everything network related the answer is “it depends”.

Dynamic IPs work independently of “allow lists”.

Not to be pedantic here, there are several solutions to this problem.

One is DHCP reservations, another one would be policy based networking where your “allow list” is automatically configured depending on who the client is and what IP it gets.

You could even implement esoteric solutions using DDNS, where the client registers his IP to a name server and your allow lists contains the DNS record, which is periodically being looked up. (worst possible solution ever, but if you are out of options you sometimes have to get dirty)

In the end it depends on the environment you have and the capability of your devices.