How to delete a DHCP Lease ?

Question

Hello all, 
 i was changing the mac address of a user that had a static ip. but the new hardware not was using the ip put static. 
 In the lease time i saw that the ip is still in lease for one day for the old mac address. Is there a way to manual delete 
 this lease so that i can change the hardware of a user in time ? 
 
 Thanks and regards 
 Marco

sysadmin@tvl · Answer

Hi.. I know this answer is very late. 
 Still I would like to mention that to release the IP lease from DHCP, you have to delete the entry that has been earlier created and then create a fresh entry for that IP. 
 Changing the MAC address in existing entry will not work. 
 I tried this in XG310 (SFOS 17.5.9 MR-9) and it worked fine. 
 
 - Sandeep Paruthi

lferrara · Answer

DHCP lease should be deletable via advanced shell by deleting the file 
 /tmp/dhcpd.leases 
 In Linux, deleting the file dhcpd.leases, will remove all the leases, but first you need to stop the dhcp service via the command "service dhcpd:stop -dsnosync", delete the file and restart the service "service dhcpd:start -dsnosync" 
 Try and let us know. 
 Regards