What is Gateway
Gateway potentially operates in all seven layers of the OSI model. A Gateway is a protocol converter and its main work to convert protocols among communication networks. A router transfer, accept and relays packets only across network using similar protocol on the other hand Gateway can accept a packet formatted for one protocol and convert it to the packet formatted for another protocol before forwarding it .
In the enterprise a Gateway is a host that routes the traffic from a workstation to the outside of the network. We have the network connection at our home and the ISP work as a Gateway to connect our PC to the internet. In the enterprise the Gateway also acts as a proxy server and the firewall.
A Gateway is generally software install with in a router. The Gateway understands the protocol used by each network linked into the router and is therefore able to translate from one to another. Gateway act as a network point for any network because it is a entrance of other network. A Gateway can be implemented as software or hardware or the combination of both. Gateways are often used to enable users at remote location to access system. The network Gateway provides the connectivity between the remote systems at remote location to access different network applications.
The Gateway provides the mutual communication by protocol conversion between public network and the private network. It routes the user traffic to the destination in the local area network or outside the network.
The Gateway has two sides –WAN side and the LAN side. The WAN side connects to cable DSL modem and the LAN side connects the private network via hub or switches.
Gateway routes the traffic from the host to the outside network like internet and from outside network to the host. In the configuration of the Gateway, first the public side of the Gateway and the IP address that is assigned by the ISP should be configured and this configuration includes IP address, DNS server, subnet mask and host name. On the private side of the Gateway DHCP should be enable.
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