![]() ![]() Again, in this case, the “NAT” notion is implied. So when you use a single router (or a gateway) for a local network, you’re in the single NAT setup. In this case, the building is your local network, its mailing address is your WAN IP address, each room within the building is a local device, and the room number is the device’s local IP address.Įach router has a NAT function. It handles packages between the building and the outside world, allowing everyone, in different rooms inside the building, to share the same shipping address yet be able to send/receive personal mail and packages. You can think of a router’s NAT function as the mailroom of a big office building. NAT allows the router to use a single WAN (public) IP address (provided by the broadband provider) to deliver Internet access to many connected devices by creating a separate sub-set of local (private) IP addresses. The Internet terminal device (modem or ONT) receives the Internet WAN IP address and passes the router. There’s one set of private IP addresses and the router connects to the Internet directly. Here’s a diagram of a standard local home network - a single NAT setup. NAT stands for network address translation, one of the major functions that define a router. But since we’ll have to deal with double NAT later, let’s find out what NAT is. In this case, you have a single NAT configuration, which is generally implied - there’s no need to mention “NAT”. In this article, you can look at an ISP-provided gateway as a router. The standard way to have any local network is to have your router connect to the Internet terminal device - generally a Cable modem or a Fiber-optic ONT.Ī gateway is a single hardware box containing a Wi-Fi router and an Internet terminal device, such as a Cable modem or a Fiber-optic ONT, on the inside. Ideally, you should use just one router for your home network. How to best deal with that ISP-provided gateway you can’t replace A different local IP address for each router is required.Making the most of an ISP-provided gateway: The Double NAT approach.Turning your new mesh system or router into an Access Point.The multiple-hardware-box scenario: You need additional Wi-Fi hardware.Customize the gateway’s advanced settings The single-box scenario - no extra Wi-Fi hardware is needed.Making the most of an ISP-provided gateway: The Single-NAT approach.Extra: The benefits of using an ISP-supplied gateway.How to best deal with that ISP-provided gateway you can’t replace.If you connect the router’s WAN port to a LAN port of the gateway, you now have a double NAT setup by default.ĭouble NAT is when you use a router on top of - or behind - another router. The former has a WAN port, and the latter has a coaxial connector for the service line.īy themselves, each creates a single NAT (standard) network. Best Cable modems: For Comcast Xfinity (and possibly other ISPs)ĭouble NAT vs Single NAT: Here’s a Wi-Fi router (left) and a Cable Internet gateway.Broadband: Fiber-optic ONT vs Cable modem (DOCSIS 3.0 vs 3.1) | How to activate a Cable modem | Broadband troubleshooting | Tips on 10Gbps Internet.Best Wi-Fi routers: Wi-Fi 6E | Wi-Fi 6 | Wi-Fi 5.Wi-Fi routers explained: How to pick that perfect one.Best mesh Wi-Fi systems: Wi-Fi 6E | Wi-Fi 6 | Wi-Fi 5.How to best use multiple Wi-Fi broadcasters: Wi-Fi mesh systems explained | Tips on getting extenders | Access point buying guide.Wi-Fi hardware: Dual-band vs Tri-band vs Quad-band | Airtime fairness and IoT devices | Common home Wi-Fi settings.Wi-Fi standards: Wi-Fi 7 | Wi-Fi 6E | 5.9GHz Wi-Fi 6 | Wi-Fi 6 | What is Wi-Fi? | Wi-Fi antennas (dBi) | W-Fi broadcasting/signal power (dBm).Everything you need to know: The basics (modems, gateways, routers, switches, etc.) | Router setup and maintenance | Tips on running network cables | Wi-Fi troubleshooting | Wi-Fi/Internet speed testing | Multi-Gig explained | Dual-WAN vs Link Aggregation | Your router and online privacy risks.On home networking, Wi-Fi, and the Internet ![]()
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