WAN Router

Last Updated on February 12, 2024 by Arnav Sharma

If you’ve looked at the back of your router, you’ve probably seen a collection of strange-looking ports. Two of the most important are WAN and LAN ports. Understanding the difference between the two is key to setting up your home network. In this blog post, we’ll dive into what a WAN port is, how it works, and why it matters.

What is a WAN Port?

  • WAN stands for Wide Area Network. This is the network that connects you to the internet. Your WAN port is used to connect your router to your internet service provider’s (ISP) modem.
  • The WAN port is a socket on your router that establishes a connection between your local network and the wider internet.


  • LAN stands for Local Area Network. This is the network of devices connected to your router at home or in your office. Your LAN ports are used to connect devices like computers, printers, and gaming consoles to your router via Ethernet cables.

The Key Difference

The big difference between WAN and LAN ports is what they connect to:

  • WAN port: Connects your router to the wider internet.
  • LAN ports: Connect devices within your home or office network.

How is a WAN Port Used?

  1. Connecting to the Modem: An Ethernet cable plugs into your WAN port on one end and the modem provided by your ISP on the other.
  2. Establishing the Connection: This connection allows the router to access the internet.
  3. Sharing the Internet: The router distributes the internet connection to all devices connected – both wired and wireless (Wi-Fi).

Additional WAN Port Information

  • Appearance: The WAN port is usually a different color and separated from the LAN ports on your router. Look for labels like “WAN” or “Internet”. It’s typically an RJ-45 Ethernet port, which looks like a larger version of a phone jack.
  • Number of Ports: Most routers have one WAN port. Occasionally, routers come with dual WAN ports for advanced uses like load balancing or failover.
  • IP Address: The WAN port receives a public IP address from your ISP, identifying your network on the internet.

WAN, LAN, and Wi-Fi: How They Work Together

Think of your home network like this:

  • WAN: The highway bringing the internet to your home.
  • Router: The traffic cop directing the internet traffic within your home.
  • LAN: The local streets within your neighborhood.
  • Wi-Fi: The wireless pathways devices use to connect to the network.

Need More LAN Ports? If you run out of LAN ports to connect wired devices, you can buy a switch and connect the switch to one of the LAN ports on the modem.


Q: What is a DSL and how does it relate to routers and internet connectivity?

DSL stands for Digital Subscriber Line, a technology for bringing high-bandwidth information to homes and small businesses over ordinary copper telephone lines. To connect to the internet via DSL, you typically need a router. This router may be a wireless router, providing a wireless network, or it can be a more traditional network device for a wired connection. The router serves as an access point to the internet service provider, facilitating a connection between your home network and the wider internet.

Q: What are the differences between WAN and LAN ports on a router?

A router typically has two types of network ports: LAN (Local Area Network) ports and a WAN (Wide Area Network) port. The WAN port is used to connect the router to the internet, usually via a cable modem or DSL. This port is kept apart from the LAN ports, which are used to connect devices within your home or office to the router, allowing them to access the internet and share data with each other. The WAN port is wired to an external network, like the internet, while the LAN ports are used for a local network, called a local area network.

Q: How does an IP address function in a computer network?

An IP address is a unique identifier assigned to each device on a computer network. It functions like a postal address, allowing data to be routed to the correct destination across the network. In the context of home networking, your router’s LAN ports assign private IP addresses to connected devices, facilitating communication within the network. The WAN port may be assigned a different IP address by your internet service provider, which is used for communication over the wider internet.

Q: Can you explain the appearance and function of RJ-45 plugs and sockets in networking?

RJ-45 plugs and sockets are commonly used in networking for wired connections. They look similar to telephone plugs and sockets but are slightly larger. RJ-45 connectors are typically used at the end of the Ethernet cable, which connects devices like computers and routers. These cables and connectors are crucial for establishing a wired connection to a network, such as connecting a router to a computer or a router’s LAN port to other devices in a home or office network.

Q: Why would a small business need a router with multiple LAN ports?

Small businesses often require routers with multiple LAN ports to connect various devices within their network. A router with four LAN ports, for example, allows a business to connect multiple computers, printers, and other devices to the network. This enables efficient sharing of resources and data among different devices. The LAN ports on a router facilitate a stable and secure wired network, which is often preferred in a business setting for its reliability compared to a wireless connection.

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