isc dhcp server and client query

[Asma Kouser]

Hi there, 
I am using ISC DHCP-4.3.6, and have a scenario in which the server is not allocating the IP address. I have updated the dhcpd.conf to give an IP address based on 'agent.circuit-id' and 'agent.remote-id' and there is only one IP in the pool to assign. When I connect a laptop the switch will add the agent info and forward it to the DHCP server and the DHCP server assigned the address which is defined in the Pool. now I have removed this laptop and connected another laptop on the same port, now the hardware address and the hostname will change but the agent information remains the same, in this case, the server is not allocating the IP address and says no free lease. Please let me know what modifications should i made to get the IP address for the second laptop. 

Also, the ISC DHCP client does not send a DHCP Discovery or a request when the ethernet link is down and up again. Please let me know what modifications should I do to achieve this as well. 

Regards, 
Asma Kouser 
Manager R&D 
Emp Code: 901567 
Ext Num: 7295 
Contact Num: 9177359511 
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