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Foglight Experience Monitor 5.8.1 - Installation and Administration Guide

Installing and configuring Multi-appliance clusters Configuring the appliance Specifying monitored web traffic Transforming monitored URLs Managing applications Foglight components and the appliance Using the console program Troubleshooting the appliance Appendix: Third party software Appendix: Dell PowerEdge system appliance

Automatically discovering subnets

The auto-discovery process examines monitored network traffic and constructs possible subnets that may be in use on your network. It is not possible for the appliance to determine the exact subnets that are in use because that information is not available in the traffic. Instead, the appliance uses the client IP addresses extracted from the IP headers in the traffic or from the x-forwarded-for HTTP header tag, and constructs a class C subnet that might be in use on your network. You may need to edit the mask portion of the subnet to match your actual subnets. The page updates every few seconds expanding the list of subnets as they are discovered.

On the Subnets page, click Auto-Discover Subnets link if you would like the appliance to suggest possible subnets that you want to configure.
Click Stop at any time to stop the auto-discover process and use the subnet list that has been compiled up to that point. All subnets that have been detected are listed (see the following illustration).

Displays the subnet number.

The number of client packets being transmitted from clients to the server.

The number of packets being transmitted from the server to clients.

The number of TCP connections that have been observed on the server.

The number of active TCP connections discovered in the traffic for the subnet.

Click Add.

Checking for overlapping subnets

Subnet definitions may be defined so that they overlap, meaning that a particular IP address will match more than one subnet definition. Trying to assess which subnets definitions are overlapping can be a difficult task to accomplish. Using the subnet mask, the system can determine whether subnet definitions are including the same IP address.

Clicking Overlap Check at the bottom of the Subnet page launches the Subnet > Overlap Check page, which lists pairs of subnets and their subnet masks. Using the subnet mask, you can identify which part of the IP address is shared by each of the subnets.

For example, in the following screen shot, AV Training shares the same IP prefix as Aliso Viejo.

Configuring a default subnet

The default subnet allows users to configure a default subnet that will capture traffic for all IP addresses that do not match any of the configured subnets that appear on the Subnet page.

From the Subnet page, click Default Subnet located at the bottom of the page.
Select the Enabled check box.

Removing subnet definitions

You can delete a subnet entry by selecting its corresponding check box, then clicking Delete.

Check All can be used to select all entries for deletion, and Clear All is used to clear any entries that were selected for deletion.

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