Routing And Switching Questions
The process of DHCP lease renewal involves the following steps:
1. Lease Expiration: When a device is assigned an IP address through DHCP, it is also given a lease duration. As the lease expiration time approaches, the device starts the renewal process.
2. Renewal Request: The device sends a DHCP renewal request to the DHCP server that initially assigned the IP address. This request is typically a unicast message.
3. DHCP Server Response: The DHCP server receives the renewal request and checks its lease database. If the IP address is still available and the lease has not expired, the server responds with a DHCP ACK (Acknowledgment) message.
4. Lease Renewal: Upon receiving the DHCP ACK message, the device updates its lease information, including the lease duration. The device can continue using the same IP address for the renewed lease duration.
5. Lease Release: If the DHCP server does not respond to the renewal request, or if the lease has expired, the device will no longer have a valid IP address. In such cases, the device must go through the DHCP lease acquisition process again to obtain a new IP address.
Overall, the DHCP lease renewal process ensures that devices can maintain their IP addresses for an extended period, as long as the DHCP server continues to allocate the address and the lease duration is not exceeded.