Setting Up OpenWrt as a Bypass Router

The specific settings are as follows.

Connecting the Bypass Router (Phicomm N1) to the Network

Check the current main router’s IP (what is the subnet).

<pre><code class="language-plaintext">Method to check the current router's IP:
1. This is actually the backend entry of the router, usually marked on the back of the router.
2. Find any device connected to this router, click on network information, and check the gateway to obtain it.

Assuming it is<span>192.168.0.1</span>, we have determined that the main router’s subnet is<span>192.168.0.x</span>.

Next, we enter the backend of the bypass router (N1) and set its IP to an IP device within the main router’s subnet management, for example, <span>192.168.0.2</span>. At this point, this N1 device is already connected to the network and is considered a device under the main router.

Main Router Forwards Requests to Bypass Router

Enter the main router’s backend

<pre><code class="language-plaintext">Log into the main router backend > DHCP > Set the gateway to the bypass router (N1) IP `192.168.0.2`

Bypass Router Forwards Responses to Main Router

Enter the backend of the bypass router Phicomm N1Log into the bypass router N1 backend

<pre><code class="language-plaintext">Set the gateway of the bypass router to `192.168.0.1` (main router IP)
Disable the DHCP service on the bypass router N1
Disable bridge mode on the bypass router N1

Summary

For ease of operation, a configuration diagram is provided.

Operations Involving the Bypass Router N1

Network > Interfaces > LAN

Operations Involving the Main Router TPLINK

Router Settings > DHCP Server

Feedback on Issues

After completing all configurations as above, if you find that wired access is available but wireless access is not, remember to add a rule in the firewall – custom rules:

<pre><code class="language-plaintext">iptables -t nat -I POSTROUTING -j MASQUERADE