How to remove ip in dhcp server lease

toiletbowl · November 23, 2016, 9:55pm

hello support

how to remove ip already lease in dhcp server?

thanks

sitloongs · November 23, 2016, 11:15pm

Hi,

Disabling and enabling back the DHCP service will flush the DHCP leased IP.

May i know any reason why you need to remove/flush the DHCP leased IP ?

Thank You

marginofsafety · March 5, 2017, 6:32pm

i’m not the original poster, but there are many reasons to terminate a lease - for example using a laptop to access different vlans with different ip ranges can create conflicts.

toiletbowl · March 24, 2017, 3:09pm

hello

yes, sometime there is IP conflict so you to release.

thanks

jmjones · March 25, 2017, 7:47am

How are there conflicts in different VLan address spaces? VLans are meant to be separate spaces. Having a MAC address in your dhcp tables twice shouldn’t matter. That dhcp lease information is only used to do translations in their reporting features (no networking or routing uses it). The networking uses information from the packets it sees and not data stored in the dhcp lease table.

I agree it is annoying to see the same client name and MAC address in the client list, but the router drops the outdated IP as soon as the last session for the old IP is aged out. It is usually less than 60 seconds (since that seems to be the default tcp expire time)

jeff.malicay · June 21, 2021, 5:22pm

Will it delete also all reserved users?

sitloongs · June 21, 2021, 6:52pm

@jeff.malicay

It won’t delete the reserved list.

If you worry , you can backup the DHCP reservation list :

Just copy and paste that list in a document and you are safe . In any bad case, you can just configure the DHCP reservation list by using the CVS format input.