A MIB module for extending the DSG-IF-MIB (ITU-T J.128 10/2008) to add objects which provide additional management information about DOCSIS Set-top Gateway (DSG) not available in DSG-IF-MIB. The DSG provides a one-way IP datagram transport for Out-Of-Band (OOB) messaging to cable set-top clients. The one-way IP datagram transport is called a DSG Tunnel. A DSG Tunnel carrying either a broadcast, unicast or multicast IP datagram stream originating at the DOCSIS Set-top Gateway and carrying Out-Of-Band messages intended for set-top clients. It is carried over one or more downstream DOCSIS channels. Multiple DSG tunnels may exist on a single downstream DOCSIS channel.