Just a recent issue I stumbled upon and wondered if anyone else has....
When I sniffed the air with OmniPeek and the network the ap was on with WireShark, I see the arp request for the gateway go to the router, the reply from the gateway router is sent out to the suspect machine in the air, the PC ack's the packet but never populates the arp cache. I have looked at both arp responses in a working vs failing scenario, both packets are the same. I don't see this being a wireless vendor issue, it's more of a Microsoft problem.
The only way I have been able to resolve it was to disable IP Helper (start up too) from Services, reboot the machine. I was seeing 3 to 4 drops per day but since disabling this Service the machines I have been testing with have not seen the issue again. It's worth trying.
IP Helper:
Provides tunnel connectivity using IPv6 transition technologies (6to4, ISATAP, Port Proxy, and Teredo), and IP-HTTPS. If this service is stopped, the computer will not have the enhanced connectivity benefits that these technologies offer.
Machines Tested and Fixed:
Lenovo E540
Lenovo W540
Acer Aspire One
Dell Latitude E6420
The ip helper service change was made on 40 laptops, a dozen of which would fail in about an hour. So far 0 out of the 40 has seen the issue since making the change and rebooting (rebooting is key after the disable) the laptops. It's been about 5 days.
Doug Hyde
Director, Technical Support / Extreme Networks
