Practice: How to connect two routers through WAN and LAN ports respectively?

The IP addresses of two routers in a network segment are the same. There are two DHCP servers working together when the two routers are connected, so there will be IP conflicts. Let's see how to connect through the WAN port and LAN port respectively.

WAN port connection

Now let's take a look at the illustrated connection method (WAN port connection):

Assume that the router connected to the Internet is router A, and the router we are going to connect to is router B.

The current settings do not require any changes to router A, but you must ensure that the DHCP function of router A is enabled, that is, it obtains an IP address automatically.

Connect the WAN port of router B to the LAN port of router A, and change the IP address of router B to: 192.168.0.1

(Note: ① Enter 192.168.0.1 when entering router B

②You can also change it to 192.168.2.1, 192.168.3.1...as long as it is different from router A)

Enable the DHCP function of router B.

Enter the WAN port settings of router B.

At 15, for WAN port connection type, select Dynamic IP address.

In the manual setting of DNS server at 14, select 192.168.1.1. We can completely hand over the resolution task to the upper-level router.

If you know the DNS of the ISP provider, you can only write theirs. For example, the DNS of our place is 202.102.152.3 (or 8.8.8.8 universal DNS). Save and exit. Then enter the router status interface and you will see that router A temporarily assigns an IP address to router B.

If you see that router B has obtained an IP address, then your above settings are complete! Now you can plug the computer's network cable into the LAN port of router B to access the Internet. If it is wireless, you can turn on your computer to receive wireless signals.

If the above is not successful, please return to the previous step and set it as follows.

Enter the WAN port and select static IP address in the connection type. Write the IP address in 6. Of course, this IP address is not in use.

At 7, enter the gateway and DNS server as shown in the figure, save and exit successfully.

It is particularly important to emphasize that:

• The computer connected to router A must follow the LAN setting rules of router A: the computer's TCP/IP properties are set to IP: 192.168.1.X (note that it cannot be the same as the WAN port IP setting of router B), subnet mask: 255.255.255.0, gateway: 192.168.1.1, DNS: 192.168.1.1 (or use the DNS provided by the network operator, such as 202.102.152.3 or 8.8.8.8, etc.);
• The computer connected to router B follows the LAN setting rules of router B: the computer's TCP/IP properties are set to IP: 192.168.0.X (X is a natural number in the range of 2-254, as long as it is not the same as the LAN port of router B), subnet mask: 255.255.255.0, gateway: 192.168.0.1, DNS: 192.168.0.1. (You can leave it blank, you can turn on the DHCP service function of router B to automatically obtain an IP address.)

To put it simply, this connection method is that router A assigns a fixed IP to the WAN port of router B, which is then assigned to the subordinate LAN port by router B to achieve the purpose of secondary routing.

Because your two routers are of the same brand, you need to change the LAN port settings of router B to avoid IP conflicts and use it normally.

LAN port connection

This is relatively simple because it does not pass through the WAN port of router B.

Same as above, do not connect to router A first, connect any computer to the LAN port of router B, enter the router default IP: 192.168.1.1 (factory default) to enter the settings of router B, and turn off the DHCP service.

Then, open the LAN port settings of the network parameters and change the LAN port IP address, for example, to 192.168.1.123 as long as it does not conflict with other IP addresses already in use.

After the settings are completed, save and restart. At this time, the IP entering router B will become 192.168.1.123.

Then connect the LAN port of router A to the LAN port of router B. Router B is equivalent to the expansion port of router A and acts as a switch. Just connect the computer to the LAN port of router B.

If you need to set the TCP/IP properties of each computer, just set it according to the rules of router A. In fact, it is connected to the IP segment of router A.