The product is the most comples network interconnection device that implements network interconnection above the network level, it could be used not only for WAN interconnection, but also for LAN interconnection.

It is a computer system or device that acts as a transformation task, it is a translator between two systems which are completely different in different communication protocols, data formats or languages. In order to route messages correctly and efficiently, core gateways need to know about other parts of internet, including routing information and subnet characteristics.

When a gateway handles heavy load and makes it very slow, and this gateway is the only way to access the subnet, this type of information is usually used, and other gateways in the network can cut the traffic flow to reduce the load of the gateway automatically.