Define your internal networks to specify which computers are part of your network. Any traffic that originates from somewhere other than these internal networks is considered "outside the network." Symantec Advanced Threat Protection (ATP) can thereby differentiate between the malware infections that affect internal computers and the attacks that originate from outside the network.
To define the default internal network
In ATP Manager, click Settings > Appliances, and then click Edit Default Appliance.
In the Internal Network Configuration panel, click +Add Internal Network.
In the Subnet field, type the IP address of your internal subnet.
For example, if your internal computers are in the range 10.42.24.0 to 10.42.24.255, type 10.42.24.0.
In the Netmask field, type the netmask for the subnet.
For example, if your internal computers are in the range 10.42.24.0 to 10.42.24.255, type 255.255.255.0.
ATP supports the wide subnets that are also known as supernets. If portions of your network are in a contiguous wide range, it is not necessary to list separate internal network entries for each range. A single wide range is sufficient.
For example, if you have a list of internal subnets as follows:
You can combine the subnets into one internal network of 10.42.0.0/255.255.0.0.
Optionally, in the Description field, type a description of the internal network.
If your internal network has computers in separate network ranges, specify additional networks.
To define a custom internal network configuration for an individual device
In ATP Manager, click Settings > Appliances, and then select the appliance name in the Appliances list.
In the Internal Network Configuration panel, uncheck Use Default if it is checked.
Follow steps 2 through 7 of the previous procedure.
To apply the default internal network configuration to a device
In ATP Manager, click Settings > Appliances, then select the appliance name in the Appliances list.
In the Internal Network Configuration panel, check Use Default.
Use Default is not available until you configure the default internal network configuration.
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