This is the first step in a guided process. The main steps of the Oracle Enterprise Manager auto discovery option are shown here below.
On the setup page select the "Host and Oracle VM Manager Discovery Using IP Scan" option. This is the option that will help you to scan a range of IP address to find hosts that can be added to Oracle Enterprise Manager.
In the below shown "Host Discovery (agentless)" screen select the create option to create a new scan.
After selecting an agent you will have to state the IP range you want to scan. In the example below I will be scanning the IP addresses 192.168.1.135 up until 192.168.1.145. You can use a number of options to specify IP ranges or hostnames. From the Oracle Enterprise Manager manual you can read the following options:
Select the agent in the IP Ranges for scan table, and enter the IP ranges to scan. You can specify any or even all of the following:
One or more absolute hostnames, each separated by a space; for example:
One or more IP addresses, each separated by a space
A range of addresses; for example:
10.0.0-255.1-250. Note that IP addresses and IP ranges must be separated by a comma; for example:
Classless Inter-Domain Routing (CIDR) notations; for example:
host1.example.com 192.168.0.1 220.127.116.11/24 10.0.0-255.1-250,254
Next to adding the information on the "Scan Details" tab you will have to specify some details under the "Job Details" tab. On this tab, as shown below you will have to enter the credentials used to perform the scan from the host where the agent is used. You will have to have configured the sudo privileges to enable the host to perform the scan.
As you can see in the above screenshot the discovery job has completed with success. By using the results of this scan you can take next steps to add the discovered hosts to Oracle Enterprise Manager.