Consider a large network with many desktops, laptops, and networked printers. Wh

Question

Consider a large network with many desktops, laptops, and networked printers. What are the advantages and disadvantages of short versus long lease times? Consider if the DHCP server is unavailable for a short time – what are the impacts if lease time is short, or if lease time is long? What do you expect is a typical lease time for most large organizations with desktops, servers, wireless devices, networked printers and other networked devices (e.g., network-connected HVAC controllers, IP camera systems)?

Explanation / Answer

Longer lease periods improve usability (especially for intermittently connected clients) and reduce DHCP request traffic, but they also increase address space utilization. Accordingly, operators want to set the longest possible lease time that still leaves sufficient spare address space. We use the algorithm from Section 5 to determine the effects of longer lease times on address space utilization, DHCP renews, and premature session expires.

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