Windows 7 does not wake from sleep to renew DHCP Lease

I am having trouble with DHCP and sleeping Windows 7 systems. My Windows 7 systems go to sleep after an hour or so. The Intel and Broadcom NICs we have use ARP offloading so they continue to respond to ARP while the machine is sleeping.
The problem is that after the DHCP lease expires, the NIC continues to respond to the ARP requests and that causes IP conflicts on the network because the computer is responding to ARP requests for an IP address the computer has lost its lease on. Any
time a computer is asleep for longer than the DHCP lease time then when a new computer gets the IP from the lost lease, an IP conflict is reported because the new leasee does an ARP to see if the IP is in use and the sleeping computers NIC responds to the
ARP and this results in an IP conflict for the new leasee.
I opened a ticket with the Hardware Vendor, which is Dell in this case, and they opened an engineering case with Intel - the NIC OEM. The outcome of this case what that this is Windows fault. Windows is supposed to wake up from sleep and renew
its DHCP lease at the lease half life and then go back to sleep. My computers are not doing this. They let the lease expire while they are sleeping.
Is there a problem with Windows 7 that prevents it from waking up and renewing its lease periodically? It is supposed to maintain the lease according to Dell and Intel, but in my case it it not.

Extending the lease time is a bandage on the problem, and it is what we have done while I attempt to resolve the issue.
The network group would like the lease time set to 4 hours.
Extending the lease time doesn't resolve the issue because it only makes the problem occur less freqently. With a 2 week lease, a machine needs to be asleep for 2 weeks before it causes a problem. Machines are not likely to be asleep for 2 weeks
very often.
The resolution would be to figure out why a sleeping Windows OS is not maintaining its IP address. If it is not going to renew the DHCP lease while it is asleep, it is still responsible for updating the TCP stack (and the NIC) to let it know that it
no longer has a lease to that IP address. The OS has offloaded ARP to the NIC, which continues to respond to ARP while the computer is asleep. If the OS lets the lease expire, then it needs to notify the NIC to stop responding to ARP requests for
that address.

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Message was edited by: rimini

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