How To Configure the External Subnet

An External Subnet enables you to specify the number of externally facing IP addresses for the Internet or external network. The maximum number of IP addresses on the external subnet connection is 2048. The default number is 16 in the Control Center. When configuring an external subnet, you need to allocate a minimum of six IP addresses.

A farm usually has only one external subnet in its topology. In some cases, adding a second external subnet would offer a benefit to the farm, such as:

• Creating more external IPs by using noncontiguous blocks of free IP addresses.

• Adding elements with external access that need to be on different subnets.

The following procedure describes how to use the Editor screen to configure an external subnet.

Steps

1. Double-click the External Subnet element.

   The Configure External Subnet dialog box appears. The Subnet IP field displays the network address for this subnet. The Subnet IP is assigned when the farm is activated.

2. Type the name in the Name field.

3. In the Mask field, select a subnet mask.

   MASK is the net mask that is applied to elements on this external subnet.

4. Type notes or comments in the Notes field.

5. (Optional) Click the Add Host Name button to reserve a name for the IP.

6. Type the DNS name in the field provided.

   This DNS name specifies the corresponding DNS prefix for each IP address that you reserve. SeeDNS Naming Conventions

7. Click OK to save your changes.

   The Configure External Subnet dialog box is closed.

See Also

See Connecting Farm Elements for netmask assignments