Today I will talk about the DHCP lease time, of course its very easy and well known setting for the DHCP. DHCP Lease Time is one of the most important settings in the DHCP configuration. What is it, how long should you set it or should you leave it at default? I will explain how it works and what settings are recommended for your network in this post. You usually see this setting for the DHCP configuration, which is usually in minutes or hours. People don't always know what to set it to, I mean what is the good number, what is it for, what does it do. Any device that shows up in a network is automatically assigned an IP address by DHCP. The DHCP lease timer is literally how long the computer will have the address. Why would you want to change the lease time? Here's an example of a waiting queue outside a trial room :). People are standing in the queue just to wait for their turn to check their clothes in the trail room. As soon as one person releases the room, the other person takes over. Let's say there are five rooms and each person takes five hours to complete a trial. How will the rest of the people in the waiting queue cope? The same way devices change every few hours, as people come and go from the building. If you have a guest SSID setup at work, imagine you have a pool of addresses that can only be used by twenty devices at once. The DHCP lease time is set for 8 hours, so the first 20 people on a business day will each be assigned an IP address, but no one else can get it for the rest of the day. This is because all of the IP addresses will be held for 8 hours starting from the time of assignation, so if someone comes at 9am, the IP address will not be released until 5pm. By reducing the lease time to one hour, if you have 20 people coming at 9am, then by 10:00am all 20 addresses will be released. As long as the devices are still present in the building, they will just renew the lease. If you have a home network where most of the devices are not likely to change frequently, a longer lease time may be beneficial. In the case of wired devices, a lease period of eight days is typically considered to be the norm. As wired devices rarely leave the network, it would be pointless to create a shorter period for wired devices to stay on the network. The network traffic related to DHCP will increase as a result of a shorter period of time. #network #networkengineer #cisco #dhcp #frankfurt
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