we have the following problem. Sometimes (most with WLAN-Clients) if a client request an ip-address from our Registrar DHCP-Server, the server sends the correct information (ip, mask, dns etc.) but don´t mark the assigned ip-address as leased in his database. So in the next time if an other client from the same ip-subnet request an ip-address the server will assign the same ip-address as befor. Because this ip-address is also available (per ping) the server mark this ip-address as unavailable and assign the second client the next free ip-address. In this scenario i have no trouble with the clients because the server send him the right ip-addresses, but if the problem occurs often there are no free ip-addresses in the subnet (because all of them are unavailable) and the clients can´t release ip-addresses.
Has anyone an idea ??