A Management Information Base (MIB) describes a set of managed objects. An SNMP management console application can manipulate the objects on a specific computer if the SNMP service has an extension agent DLL that supports the MIB.
Each managed object in a MIB has a unique identifier. The identifier includes the object's type (such as counter, string, gauge, or address), the object's access level (such as read or read/write), size restrictions, and range information.
The following table lists the MIBs that ship with Windows NT. They are installed with the SNMP service.
| MIB | Description |
|---|---|
| ACS.MIB | Microsoft-defined MIB for the ACS service |
| DHCP.MIB | Microsoft-defined MIB for the DHCP service |
| FTP.MIB | Microsoft-defined MIB for the FTP service |
| GOPHERD.MIB | Microsoft-defined MIB for the Gopher service |
| HOSTMIB.MIB | Host Resources MIB |
| HTTP.MIB | Microsoft-defined MIB for the HTTP service |
| INETSRV.MIB | Microsoft-defined MIB for IIS components |
| IPFORWD.MIB | IP Forwarding MIB |
| LMMIB2.MIB | LAN Manager MIB-II |
| MIB_II.MIB | MIB-II |
| MIPX.MIB | Microsoft-defined MIB for the IPX Protocol |
| MRIPSAP.MIB | Microsoft-defined MIB for the RIP routing protocol |
| MSFT.MIB | MIB that defines Microsoft's enterprise OID |
| MSIPBTP.MIB | Microsoft-defined MIB for the BootP service |
| MSIPRIP2.MIB | Microsoft-defined MIB for the RIP2 routing protocol |
| NIPX.MIB | Novell-defined MIB for the IPX Protocol |
| SMI.MIB | MIB that defines SMIv1 information |
| WFOSPF.MIB | WellFleet-defined MIB for the OSPF routing protocol |
| WINS.MIB | Microsoft-defined MIB for the WINS service |
The extension agent DLLs for MIB-II, LAN Manager MIB-II, and the Host Resources MIB are installed with the SNMP service. The extension agent DLLs for the other MIBs are installed when their respective services are installed. At service startup time, the SNMP service loads all of the extension agent DLLs that are listed in the Windows NT registry.
Users can add other extension agent DLLs that implement additional MIBs. To do this, they must add a registry entry for the new DLL under the SNMP service. They must also register the new MIB with the SNMP management console application. For more information, see the documentation included with your management console application.