DHCP Unavailability Consider a large network with many desktops, laptops, and ne
ID: 3669304 • Letter: D
Question
DHCP Unavailability
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)?
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Explanation / Answer
if Company have lots of machines that use up most of your available scope.. you might want a shorter lease, to free up addresses as machines go off the network.Or if your dns, or other options that can be handed out with dhcp change often - then a short lease time might be better to speed up how fast these changes would get pushed out, etc..If Company have lots of machines and do not make changes to your options, and your not worried about address space.. Or you want machines to be able to be off the network for awhile and when they come back still get the same address they had last time, and your looking to lower the network traffic for dhcp -- then a longer lease would make more sense.But for the typical home setup.. whatever the default is should be fine, which quite often is 24 hours.
BTW -- which lease are we talking about, the one the cable modem gets from your ISP.. or the one your routers dhcp hands out to your clients? Most of the time you do not have an option to request a longer lease from your ISP.. and even if you could request a specific length -- they most likely just hand out whater they want to hand out - and could care less if you request a longer one or not, etc..
The lease command takes up to three options: lease days [hours] [minutes], with hours and minutes being optional. You can specify a maximum period of 365 days, 23 hours and 59 minutes, and a minimum of 1 second. The default is one day.
The shorter the lease period, the faster you can reconfigure DHCP options that may need to change. Short lease periods also permit IP addresses to be returned to the address pool for reallocation more quickly. This can be useful in environments where a large number of end devices connect and disconnect frequently, as in public wireless networks, such as at an airport. A short lease period of say 30 minutes might be useful to ensure that IP addresses are returned quickly to the shared pool. However, short lease periods also mean that workstations must renew their leases more often, which puts an extra strain on the network and DHCP server.
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