I got 500 computers on a network using dynamic ip addressing by DHCP operating at class B (255.255.0.0). Each 4 computers are connected to a switch. The network oftenly experiencing subnet mask clashes that is the subnet mask automatically changes from class B to class A(255.0.0.0). anyone ever experienced this problem? any concrete solution or reason why this abnormal situation oftenly occur on my network?
I have only one DHCP server running on windows server 2000. Despite that the 500 workstations dont have the right to change the ip address or subnet mask still the subnet mask change from class B to Class A. That is when i go to the Local Area Connection, choose Properties, choose IP Protocol, click Properties, and see if the subnet mask i noticed that it has been change from 255.255.0.0 to 255.0.0.0. or even when i check it using ipconfig. any suggestion why?
