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The ranges table displays each defined range, its type (CIDR, IP Range, or IP Pattern), and its use in the discovery process. Ranges excluded for discovery indicate that any network device found matching that range is excluded from discovery by the appliance. See For more information, see Range Examples for more information.

Creating Discovery Ranges

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If more than one network view exists, you can choose the network view with which the discovery range will be associated, by clicking the Network View drop-down menu. If only one network exists in NetMRI, this setting does not appear. The chosen network view must also be associated with a scan interface, otherwise, discovery does not take place. Unassigned network views that do not have an assigned scan interface or virtual scan interface appear with a caution icon () in discovery ranges configuration. For more details, see Configuring Network Views.

Network views can contain multiple discovery ranges. So when you create other ranges, you can assign the same network view to each. However, you can assign each discovery range to only one network view. Also, ensure that the ranges you assign to each network view make sense. Selecting the network view in an Operations Center environment also involves other details. For more information, see Defining Discovery Ranges on Operations Center Collectors.

You can define discovery ranges that will be excluded from management. This is useful for devices you may not want to manage, but want to know about for inventory purposes. End Host network segments are a good example.

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1. Obtain or calculate the network range values. You can define a Network address (expressed as CIDR: in effect, a subnet prefix), an IP range, or an IP pattern.
2. Choose Click the Settings icon > Setup > Discovery Settings > Ranges.
3. Click New.
4. Choose an appropriate way to specify the range: 
   • CIDR: Enter the IP Prefix value and its CIDR subnet value in the drop-down.
   • IP Range: Specify an IP range using a beginning and ending value.
   • IP Pattern: Specify a wildcard pattern for matching IP addresses.
5. For Discovery Mode, select one of the following:
   • Include in Discovery: Any device found matching that range is discovered and managed by NetMRI.
     Discovery gives the highest precedence to devices found in an Include in Discovery range, ensuring they will be the first to appear in information tables in the appliance.

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8. Select the Enable Change Blackout check box and click its Scheduling icon. Follow the instructions for the Enable Discovery Blackout setting in the previous step.

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