The Grid Gateway graphical user interface offers a default gateway feature; it's available in the server group, load balancer, and firewall configuration dialogs.
A gateway is a network point that acts as an entrance to another network. On the Internet, a node or stopping point can be either a gateway node or a host (end-point) node. Both the computers of Internet users and the computers that serve pages to users are host nodes. The computers that control traffic within your company's network or at your local ISP are gateway nodes.
In the network for an enterprise, a computer server acting as a gateway node is often also acting as a proxy server and a firewall server. A gateway is often associated with both a router, which knows where to direct a given packet of data that arrives at the gateway, and a switch, which furnishes the actual path in and out of the gateway for a given packet.
The default gateway sets an IP address on one of the local subnets to be the default gateway for the device. The user selects from a drop-down list of devices (interfaces) or chooses None.
If a device is on an external subnet, then the selection will default to the external router for the infrastructure unless another device is chosen as the default gateway.
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