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To use an OpenWrt router as your home gateway, connect its WAN port to your modem or upstream router and connect household devices to its LAN or Wi-Fi. Keep the WAN and LAN on different IP subnets, and leave the firewall and DHCP enabled for the ordinary router setup. If you keep your ISP router in front, OpenWrt will usually create a double-NAT arrangement.

Choose how OpenWrt will connect to the internet

There are two common ways to place OpenWrt in your home network. The right choice depends on what your ISP equipment supports and whether you need features such as inbound connections to a server or particular online games.

Arrangement Connections and network roles Trade-offs
Keep the ISP router and add OpenWrt Connect OpenWrt’s WAN port to an unused LAN port on the ISP router. Both routers commonly perform NAT and provide DHCP. This cascaded setup is usually the simplest to configure, but double NAT can complicate hosting services reachable from the internet and some peer-to-peer games. OpenWrt’s router, switch, gateway and NAT guide describes cascaded, bridge and exposed-host approaches.
Bridge the ISP equipment and use OpenWrt as the gateway If the ISP device and service support bridge mode, the upstream device passes the connection to OpenWrt, which handles routing and NAT. Whether this is available, and how to configure it, depends on the ISP equipment and service. Confirm any provider-specific WAN protocol, authentication or VLAN requirements.
Replace the ISP router directly Connect OpenWrt to the modem or other provider handoff, then configure its WAN for the ISP’s requirements. WAN settings are provider-dependent. DHCP is the usual straightforward default when OpenWrt is behind another router; it is not a universal setting for a direct ISP connection.

For the standard gateway arrangement, OpenWrt separates the upstream WAN network from the downstream LAN. Its documented router-device setup generally uses factory defaults with firewall and DHCP enabled; when the upstream is another router, WAN is normally configured as a DHCP client. See the OpenWrt router-device guide.

Prepare the device and install the correct OpenWrt build

  1. Check the exact model and hardware revision. Confirm that your device is supported and follow its current installation instructions. Firmware images and physical port mappings vary by model, so do not select an image based on a similar-looking router name. OpenWrt’s documentation index links to device and setup documentation.
  2. Connect a computer to a LAN port. Use the device-specific initial access method to open the management interface. Keep the computer on the LAN side while configuring the router.
  3. Check the upstream subnet before changing LAN settings. If the ISP router uses 192.168.1.x, OpenWrt’s default LAN range may overlap. OpenWrt’s documented example is to set its LAN address to 192.168.2.1 instead. After applying a new LAN address, the management session will move; record the address and reconnect to it.
  4. Connect WAN to the upstream device. In a cascaded setup, run Ethernet from OpenWrt’s WAN port to an unused LAN port on the ISP router. If OpenWrt connects directly to a modem or provider handoff, use the WAN settings required by the ISP rather than assuming DHCP.
  5. Keep gateway services enabled. For the normal router mode, leave OpenWrt’s firewall and DHCP server on. DHCP gives LAN clients network settings, while the firewall helps control traffic between network zones and the internet.
  6. Set up Wi-Fi for the installed release and hardware. Wireless configuration depends on the OpenWrt release and radio capabilities. Then test access from both a wired LAN client and a wireless client.

Check that the WAN and LAN networks do not overlap

The LAN is the network for your household devices; WAN is the network on the upstream side. Their IPv4 address ranges must be distinct for routing to work correctly. For example, if the ISP router is on 192.168.1.0/24, using 192.168.2.1 for OpenWrt’s LAN is the documented example of moving the downstream network to a different range. Do not copy the example blindly if your upstream uses another range.

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After changing the LAN address, reconnect to the new management address before continuing. The precise menu labels can differ between OpenWrt releases, so use the network configuration instructions for the version installed on your device.

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Diagnose a working management page but no internet

  1. Check the WAN cable and port. Confirm that the cable runs from OpenWrt’s WAN port to the modem or upstream internet device. For the cascaded arrangement, the other end belongs in an ISP-router LAN port.
  2. Inspect the LAN and WAN IPv4 addresses. If their address ranges overlap, change the OpenWrt LAN subnet to a distinct range, then reconnect using the new LAN management address. OpenWrt’s internet connectivity troubleshooting guide covers basic connection checks.
  3. If WAN has no address, check upstream requirements. Verify the upstream router or modem is providing service, then confirm the WAN protocol and any required authentication or VLAN configuration with the ISP. Do not try to fix a missing WAN address by randomly changing LAN DHCP or firewall settings.
  4. Test both connection types. Check one wired client and one Wi-Fi client. If wired access works but Wi-Fi does not, focus on wireless configuration; if neither has internet, continue checking WAN connectivity and upstream settings.

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