Cascading Wifi Range Extenders

There's a lot of people who want to know how to cascade Wifi Range Extenders in series, some others claim its not possible.

What do I mean by cascading? Well, you have a router in a corner of the house. You extend its range by using a range extender-1. Ok? Then you want wifi coverage in your garden but the current range extender-1 doesn't cover it. So you connect another range extender-2 it to the existing range extender-1. This is what I meant by cascading. Note that Range extender-2 is only connected to Range extender-1 and not the modem or router.

This is perfectly possible but follow the below to the word:

1) Router / Modem Setup

1. You need to know the IP address of the router. 
2. From a computer connected to the router by wifi or cable,  Open Command Prompt and type "ipconfig" (Assuming you are using windows)
3. The resulting list shows your the following:
4. IPv4 : 192.168.1.100 (IP Address of your PC)
5. Subnet Mask: 255.255.255.0
6. Gateway: 192.168.1.1
7. The gateway is the IP address of your router. It is different with different manufacturers. 
8. Type this IP in your browser in the address bar to access the setup page
9. Find DHCP and check what is the range of IP's offered. DHCP is jargon for the service in the router that issues IP's to users. 
10. The range should be something like this: 192.168.1.100 to 192.168.1.150. You can modify if you need a different range. 
11. Remember that the DHCP range will be in the same subnet as the IP of the router. 
12. Also note down the wifi encryption used in the router. It should be WPA Personal or WPA2 Personal and AES or TKIP or Both as the encryption algorithm. 
13. Write down the DHCP range, default IP, wifi encrption details for your reference. 

2)   Range Extender -1 Setup

1. Disconnect the Router from the pc
2. Now Connect the Range Extender-1 to the pc.
3. Open a browser and key in the default IP of the Range Extender to access its setup page
4. Do not go for the auto setup stuff. We solve problems like men and not the easy way out. :D
5. Most cases the default IP will be 192.168.1.1. We need to change this since it will conflict with the router. 
6. Change the default IP to 192.168.1.254. Something out of the DHCP range of the Original Router. 
7. Reboot the router and use the new IP we assigned to connect to its setup. 
8. DISABLE DHCP in the Extender. THIS IS IMPORTANT. DHCP as I said, is Dynamic Host Control Protocol, the jargon used for the service that assigns IP to users or devices. We already have the router who has DHCP running. More than one DHCP services will cause IP conflicts in the network. So do not believe the device if it says "SmartDHCP" like in TP Link extenders. This is an auto feature that disables the DHCP server if the extender detects another DHCP server in proximity. But sometimes it fails in detecting other DHCP servers connected to it and thus runs its own DHCP server, thereby causing IP conflicts and then fails to connect.  
9. Enable Static IP and we already changed the default ip in step 5. Remember the subnet of the extender IP address has to be the same as that of the router. 
10. Gateway should be the router IP: 192.168.1.1
11. Power on the router and now go to the wireless tab of the Extender. Scan for the wifi from the router using the survey button. 
12. Once it scans and shows the different wifi available, choose your wifi from the list and enter the password for it. 
13. Remember to select the same encryption on the range extender as it is on the router. 
14. If the range extender allows you to change name of the SSID, go ahead and change it to anything you want. "Bedroom" for example. So you can know which wifi signal you are connected to. If your extender does not allow to change name, it will copy the same name as that of the router. That is fine. Your devices will roam seamlessly through the wifi signal of your router and that of the extender, if both are the same name. If not, the phone or tablet will automatically connect to the stronger signal based on where you are. 
15. Click connect and let it reboot. 
16. Now your range extender is setup and will use the DHCP server from the router. All IP's issued to devices on the network will be from 192.168.1.100 - 101- 102 ... and so on.  
17. You can verify the connection by opening the browser (while the pc is connected to the range extender) and entering the default ip of the router in the browser: 192.168.1.1. The router default page should show up. 
18. Place the range extender in the room where you get medium to low coverage where your phone can still connect to the router. 

3) Range Extender -2 Setup

1. Follow the same as Range Extender-1 setup except for the below points: 
2. Use default static ip for range extender -2 as 192.168.1.253
3. Disable DHCP server on the range extender -2
4. Gateway should be the router IP: 192.168.1.1
5. In Wireless, use site survey to select the range extender -1 wifi. 
6. Enter password and security details as before. 
7. Change the name (SSID) if you want and your extender allows it.

Voila! You have connected two range extenders in cascade where these devices will complement each other and cover dead spots. 

If you take care of these points, you can cascade as many extenders as you would want but remember, the more the extenders, the more is the interference on the wifi channel / frequency and it could lead to slower speeds. Otherwise you are good to go for using 2 or more extenders to cover dead spots in your house or office.