Discovery Mechanism

1. DFM runs a ping sweep for client type IP ranges to get details of the active client machines.

2. DFM runs through the credentials defined for the protocol and tries to connect successfully through one of them. Whenever there is a successful connection, the discovery remembers the last successful credential and caches it for reuse the next time the discovery is run.

3. DFM executes an SNMP query and obtains the class name, vendor name, host OS name, host model, host version, and host release:

   Using OIDs:
       SNMP MIB-2 System 1.3.6.1.2.1.1
   SNMP MIB-2 Interfaces 1.3.6.1.2.1.20
   3.
   x3x.x3.x.xxxxxxxxxxx x
   The vendor's authoritative identification of the network management subsystem obtained from the system table.

4. DFM retrieves the host IP and mask:

   Using OIDs:
       ipAdEntNetMask (1.3.6.1.2.1.4.20.1.3) for subnet mask
       ipAdEntBcastAddr (1.3.6.1.2.1.4.20.1.4) for the least-significant bit in the IP broadcast address
       ipAdEntIfIndex (1.3.6.1.2.1.4.20.1.2) for the index value which uniquely identifies the interface

5. DFM retrieves the network interface information:

   OID (1.3.6.1.2.1.2.2.1) - an interface entry containing objects at 
   the subnetwork layer and below for a particular interface.

6. DFM retrieves the default gateway:

   Used OIDs:
       ipRouteDest (1.3.6.1.2.1.4.21.1.1) -
    for the destination IP address of this route
       ipRouteMask (1.3.6.1.2.1.4.21.1.11) -
    for the mask
       ipRouteDest (1.3.6.1.2.1.4.21.1.1) -
    for the destination IP address of this route
       ipRouteMetric1 (1.3.6.1.2.1.4.21.1.3) -
    for the primary routing metric for this route
       ipRouteNextHop (1.3.6.1.2.1.4.21.1.7) -
    for the IP address of the next hop of this route

7. DFM retrieves the serial number of the host. It will get the serial number from a public MIB, or failing that a private MIB. In both cases it retrieves the OID. This job supports a wide range of devices. However, should the serial number be available but DFM is unable to extract it, you should open a Support Case (ensuring you provide full details from MIB Walk ) so we can add support in a future Content Pack or Update.

8. If possible, DFM retrieves remote management cards of the host. For example, HPE iLO cards, or Dell DRAC cards.

   Get iLO cards from OID table 1.3.6.1.4.1.232.9.2.5.1

   Get DRAC cards from OID table 1.3.6.1.4.1.674.10892.1.1900.10