In this part you will see how the home gateway is a router, passing traffic between the LAN and the internet.
Now watch the video below, which is about 4 minutes long.
The home gateway is the router which connects the LAN to the internet; all traffic from the LAN to the internet therefore passes through this gateway. The gateway itself will connect to a router at an ISP, and through that to the rest of the internet. Since home gateways often connect to the internet via a broadband phone line, they often include a modem to convert signals to the form required for transmission over phone lines.
The gateway will use network address translation (NAT) so that private addresses can be used on the home network.