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Force the DHCP server to renew the IP address of a client machine, without doing anything in client machine

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http://serverfault.com – I would like to know, if there is a way I could force the DHCP server to renew the IP address of a client machine instantly, without me going to the client machine? In fact, imagine, I don't have access to the client machine. So, here is my scenario, The client first gets a Random IP address say A from the DHCP server initially, when it is connected to the LAN. Imagine, someone connected the client to the LAN and he didn't map any IP address to its MAC address in the dhcpd.conf to begin with. I would like to mention here that, there are other machines in the same subnet that already have I (HowTos)