Can a DHCP server back up another DHCP server

20. Can a DHCP server back up another DHCP server?
You can have two or more servers handing out leases for different addresses. If each has a dynamic pool accessible to the same clients, then even if one server is down, one of those clients can lease an address from the other server.

However, without communication between the two servers to share their information on current leases, when one server is down, any client with a lease from it will not be able to renew their lease with the other server. Such communication is the purpose of the “server to server protocol” (see next question). It is possible that some server vendors have addressed this issue with their own proprietary server-to-server communication.

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