How to Connect One Router to Another to Expand a Network? Two router configuration i.e. Primary Router and Secondary Router.

Brief

Two router configuration i.e. Primary Router and Secondary Router. Below are the steps:

Gather Your Equipment

1. Identify the routers with which you will be working.
2. Have a computer available to set up the routers.
3. Have one Ethernet cable (also called "network cables") available for each device.
4. Make sure you have enough power outlets available to plug in two routers, plus any additional devices.
5. Unplug the power from both routers.

Set Up Router 1

1. Run an Ethernet cable from the WAN port of Router 1 to the WAN/Internet port of the high-speed modem.
2. Run an Ethernet cable from one of Router 1’s LAN ports to the computer’s Ethernet port.
3. Turn on the modem and router.
4. Open a web browser.
5. Bring up the router’s admin interface in your web browser.
6. Log in using the router admin username and password combo.
7. Make sure that DHCP is enabled on Router 1.
8. Test your network and internet connection.
9. Remove the Ethernet cable between the Router 1 and the computer.

Set Up Router 2

1. Plug in Router 2 and turn it on.
2. Run an Ethernet cable from the LAN port on Router 2 to the computer.
3. Open the router’s admin interface in a web browser.
4. Disable DHCP on Router 2.
5. Assign a new IP address to Router 2.
6. Configure Router 2's Wi-Fi name and passkey to be identical to Router 1.

Bring Your Network Online

1. Disconnect the power from Router 2.
2. Connect an Ethernet cable from a LAN port on Router 1 to the first LAN port on Router 2.
3. Plug Router 2 back in and turn it on.
4. Restart the computer that’s connected to Router 2.
5. Connect other computers and devices wirelessly, or via Ethernet cables to open LAN ports on either router.
6. 
   

Reference: https://www.wikihow.com/Connect-One-Router-to-Another-to-Expand-a-Network