Creating a Subnet

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The subnet feature of WhatsUp Gold allows you to create separate maps for different segments of your network, yet maintain a connection between the maps.

If you already have a parent network map, you can create a second network map for a particular network segment and then link it to the parent map; this makes the second map a "subnet" of the parent map.

Note: If you have a hierarchical network that uses SNMP, subnet maps can be created automatically by using SmartScan. For more information see, "Mapping a Hierarchical Network (SNMP)".

WhatsUp Gold can simultaneously monitor the parent network map and any subnet maps. When a device or service goes down in a subnet map, the subnet icon on the parent map changes color to indicate that there's a problem in the subnet. The subnet icon in the parent network map will have the color of the highest priority alarm that occurs in the subnet map. For example, if only one device in the subnet does not respond to four polls, the subnet icon is red.

To create a subnet map (assuming you already have a parent map):

1. Create a new map and add the devices for the subnet. You can use any of the methods for creating a network map described in the previous section. You can also copy and paste devices from an existing map.
2. Save the new map.
3. Open the parent map or, if it's already open, make it active.
4. Click the Edit Mode tab to view the editing toolbars.
   
5. Click the Subnet icon and drag it where you want to create the subnet icon.
6. Right-click the subnet icon, select Properties, and click General.
7. In the Display Name box, enter the desired name for this subnet.

Note: Some refer to this subnet map as the "child" map, and the map that contains the subnet icon has often been referred to as the "parent" map.

8. In the Map Name box, enter the name of the "child map" that you want this subnet to open.

Note: You can include the .wup extension or you can leave the extension off.

9. Click Monitor, make sure Monitor This Item is selected.
10. Click OK.
11. Click the Map tab to go back to monitor mode.

When you open a network map, WhatsUp Gold can also open any associated subnet maps and start monitoring them. From the Configure menu, select Program Options->General, and then select Automatically load subnets when opening maps.

If a subnet map window is not opened, you can right-click the subnet icon and select Load Subnet from the menu to open it.

If a subnet map is open but is hidden behind other windows, you can right-click the subnet icon and select View Subnet to bring the subnet map to the top.

To connect a subnet map to its parent map:

1. Right-click on a blank space on the subnet map, select Properties, and click Network.
2. In the Parent Map list box, select the correct parent map for this subnet map (child map).
3. Click OK.

Note: If you do not tell the subnet map (child map) who the parent map is, you will not be able to go to View, and select Parent Map (it will be grayed out), nor will you see from the right-click menu on the map the choice to select Parent Map.

Note: From within a subnet map, you can open its parent map by right-clicking and selecting View parent map, or from the View menu, by selecting Parent map.

Subnet Settings. The main purpose of these settings is to set a Parent Map for the current map. If you created the map using SmartScan, then each subnet map will already have an entry for the Parent map. To change the Parent map, select any of the maps shown in the list box. This list shows all open maps.

To view a subnet's parent map, right-click on the map, and select View parent map, or from the View menu, select Parent map.

This dialog box also shows the Network and Netmask settings for the network segment that this subnet map represents. These settings provide the default address settings for the Scan tool, if it is started when this map is active.

Network. Shows the starting IP address for this network segment.

Netmask. Shows the netmask for this network segment. The netmask defines how to read the IP address to identify subnets and devices.

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