An internet gateway device connects networks by routing Internet Protocol (IP) traffic between them. At home, the term usually refers to a broadband router that connects your local network to your internet provider’s network. A gateway may combine a router with a modem, Wi-Fi, and other features, but the word “gateway” by itself does not guarantee that it includes them.
What does “internet gateway device” mean?
In networking standards, a gateway performs IP-level routing: it forwards traffic between separate IP networks. RFC 1009, published in June 1987, defines an internet gateway as “an IP-level router” and describes its interfaces to two or more packet networks. The gateway function can be implemented in a host operating system, so it does not have to be a dedicated physical box.
In home broadband usage, “Internet Gateway Device” often means customer-premises equipment—typically a broadband router—that connects a household LAN (local area network) to a provider-facing WAN (wide area network). Broadband Forum TR-098 version 1.2.0, published in 2008, uses this more specific residential-device sense.
Is an internet gateway the same as a router?
In the standards context, the terms overlap: RFC 1009 uses “gateway” for an IP router, and RFC 1812 describes requirements for devices that forward traffic at the Internet Protocol network layer. In consumer product descriptions, “gateway” can also imply a combined broadband unit, while “router” describes the network-routing role or a product centered on that role.
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How is a gateway different from a modem?
A modem provides an interface to a broadband access service, translating or adapting signals for that connection. A gateway’s defining role is to route IP traffic between networks. A single home device may include both a modem and a router, but a gateway label alone does not establish that a modem is built in. Some internet services use an ONT (optical network terminal) rather than a modem for the provider connection.
What functions can a home gateway include?
A residential gateway may combine several networking components. RFC 7216, published in 2014, lists functions a residential gateway can encompass; these are possible integrations, not requirements for every gateway.
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- Router: forwards IP traffic between the home network and the WAN.
- Modem or ONT: provides the connection interface for a particular broadband access technology, if integrated.
- Wi-Fi access point: connects wireless devices to the home network.
- Ethernet switch: connects wired devices within the LAN.
- NAT: translates network addresses for traffic crossing network boundaries.
- DHCP server: assigns network configuration, such as IP addresses, to devices.
- DNS relay: forwards devices’ domain-name lookup requests.
- Firewall: applies rules to network traffic.
Because manufacturers combine these functions in different ways, check a product’s specifications rather than assuming a particular feature is included.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should you look for when identifying a home gateway?
For a household, “residential broadband router” is a useful product-category term for an internet gateway. Whether a particular device will work with your service depends on details the generic definition does not settle. Check these points against your ISP’s requirements:
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- The WAN connection type and whether the device supports your provider’s access technology.
- Whether you need a separate modem or ONT, or one is already built into the device.
- Whether Wi-Fi and Ethernet ports are included and meet your household’s needs.
- Which network features—such as NAT, DHCP, DNS relay, and firewall functions—are integrated.
“Internet Gateway Device” is also the name used in the UPnP Internet Gateway Device control protocol. ISO/IEC 29341-24-1:2017 covers that protocol at Level 2; the name does not mean every router implements it, and it is not the general definition of an internet gateway.
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