Continuing Leases

Three things might occur during the course of a lease: A client might remain connected to the network, the client might be gracefully shut down, or the client might crash. Each of these carries with it different consequences. The two disconnection scenarios, a graceful shutdown and a crash, might each also carry with them two possibilities when the client reconnects.

In the case of a graceful shutdown, many clients send a DHCPRELEASE message to the DHCP server. This is not required, so it is not universally employed. If such a message is sent, the IP address is immediately returned to the pool. If the client does not send this message, the results are the same as a crash—the lease remains until expiration, until it is removed ...

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