After initial setup, you seldom need to change the network settings unless something in your network changes, such as adding a new gateway or DNS server. These options are for Access Gateway Appliance. For Access Gateway Service, use the utilities supplied by the operating system. However, if you add an new network interface card to Access Gateway Service machine and use system utilities to configure it and assign it an IP address, you need to update Access Gateway Service with this information. See Adding a New IP Address to Access Gateway.