We have been seeing a lot of ARP traffic come over the routers, the results of external scans. In an effort to reduce the ARP traffic broadcast to the wireless network, we are decreasing the size of the wireless address space to clear out unused addresses. We would then blackhole requests for those addresses not given out.
In order to expedite the reclamation, we are setting the DHCP lease times to a low value to help us clear out addresses in the space we would like to blackhole. Once we have executed this plan, we expect to put the lease times back to previous settings. Thanks to all those who helped come up with this solution and execute, and especially all those on the NetOps 58Crew. --Brett