Hello,
We are a WISP and have a few sites that haven’t been moved to PPPoE yet, they are still on DHCP for end user provisioning. Something very strange happened while I was logged into one of those DHCP site’s routers. All I was doing was making a supout and suddenly there were a hundred DHCP lease offers. I figured maybe something had been down and came up. Then I got an alert that a pool was suddenly full, one of our larger sites, but it is normally at 60% usage only.
I investigated more closely and found that the DHCP->leases tab shows the subnet only half full, but under IP->Pool->Used addresses, it shows the subnet completely filled with addresses given via DHCP, yet half of those listed are not in DHCP->Leases. In IP->Pool->Used addresses I see two DHCP leases for each MAC vs. one DHCP lease for each MAC in the DHCP->Leases tab. These extra leases in IP->Pool->Used addresses also show up in IP->ARP with blank MAC field.
I don’t know how to free up the fake leases from IP->Pool->Used addresses short of rebooting the device. I have tried deleting the pool and re-adding the pool, it did not help, now the extra leases just show Pool->Unknown. If I delete the leases from DHCP->Leases I don’t think it will help because the duplicates that I want to get rid of do not even appear there.
Any ideas? Anybody seen this before?