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Network DHCP Lease Renewal

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#1 ChrisCulp


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Posted 17 November 2017 - 03:07 PM




Quick question that I couldn't find with a simple google search.


Does a computer lose connection to the internet while it's DHCP lease is being renewed?


For example, our leases are set for 8 hours. I have a computer that needs one or two DAYS of internet connection to run some software updates.


Will the updates be interrupted when the lease expires? Do I need to temporarily set our leases to expire in a couple days instead of 8 hours?


Or do leases renew with no interruption of internet connection?



Thank you all for your help.






EDIT: Found an article that states halfway through a DHCP lease the computer will request a renewal. 

Edited by ChrisCulp, 17 November 2017 - 03:39 PM.

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#2 Kilroy


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Posted 17 November 2017 - 04:28 PM

The short answer is no.  However, if the DHCP server went down for more than eight hours it would be an issue.


Unless you have a high volume of roaming users where running out of IP addresses is an issue you probably should lengthen the DHCP lease time.  Devices will attempt to renew their lease at 50% of the lease time.  The shorter the DHCP lease the more network traffic created to obtain and maintain an IP address.  For example a 24 hour DHCP lease will only renew the lease every 12 hours.


Short leases are good for places like a training site where you may get a batch of new users every day, so you need to keep a large number of addresses available.  If your site is mainly static computers, like desktops, a longer lease makes more sense.

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