Hello TP-Link Support Team, I am using TP-Link Archer C6 (Hardware Version V6) purchased from your official Daraz store in Pakistan. The device is still under warranty. I am using this router in Access Point (AP) mode, not as a main router. My network setup is: PTCL main router → LAN cable → Archer C6 (AP mode) → connected devices (PC, DVR, etc.) I am facing a serious issue after updating to firmware version: 1.1.2 Build 20251212 Rel. 63031 Problem details: - When my PC is ON → LAN port shows 1000 Mbps and internet works normally. - When PC is OFF but LAN cable is still connected → LAN port drops to 10 Mbps. - At that moment, the entire WiFi speed from Archer C6 also drops to around 9–10 Mbps. - When I unplug the LAN cable → everything becomes normal again. Important observations: - Before the firmware update, this issue did NOT occur. - I have already performed a full factory reset and configured the device again in AP mode. - I tested multiple LAN ports and the issue persists. - I also tested with minimal devices connected, but the issue still happens. Additionally, the router shows the message: “WAN port does not support gigabit speeds” I would like to clarify: - Is this issue caused by a firmware bug, hardware fault, or LAN cable issue? - Should I replace the LAN cable first? - Or is this device eligible for warranty replacement? Kindly guide me on the proper solution.

Hello TP-Link Support Team, I am using TP-Link Archer C6 (Hardware Version V6) purchased from your official Daraz store in Pakistan. The device is still under warranty. I am using this router in Access Point (AP) mode, not as a main router. My network setup is: PTCL main router → LAN cable → Archer C6 (AP mode) → connected devices (PC, DVR, etc.) I am facing a serious issue after updating to firmware version: 1.1.2 Build 20251212 Rel. 63031 Problem details: - When my PC is ON → LAN port shows 1000 Mbps and internet works normally. - When PC is OFF but LAN cable is still connected → LAN port drops to 10 Mbps. - At that moment, the entire WiFi speed from Archer C6 also drops to around 9–10 Mbps. - When I unplug the LAN cable → everything becomes normal again. Important observations: - Before the firmware update, this issue did NOT occur. - I have already performed a full factory reset and configured the device again in AP mode. - I tested multiple LAN ports and the issue persists. - I also tested with minimal devices connected, but the issue still happens. Additionally, the router shows the message: “WAN port does not support gigabit speeds” I would like to clarify: - Is this issue caused by a firmware bug, hardware fault, or LAN cable issue? - Should I replace the LAN cable first? - Or is this device eligible for warranty replacement? Kindly guide me on the proper solution.

  @Joseph-TP 

 

Hello TP-Link Support Team,

 

I am using TP-Link Archer C6 (Hardware Version V6) purchased from your official Daraz store in Pakistan. The device is still under warranty.

 

I am using this router in Access Point (AP) mode, not as a main router.

 

My network setup is:

PTCL main router → LAN cable → Archer C6 (AP mode) → connected devices (PC, DVR, etc.)

 

I am facing a serious issue after updating to firmware version:

1.1.2 Build 20251212 Rel. 63031

 

Problem details:

 

- When my PC is ON → LAN port shows 1000 Mbps and internet works normally.

- When PC is OFF but LAN cable is still connected → LAN port drops to 10 Mbps.

- At that moment, the entire WiFi speed from Archer C6 also drops to around 9–10 Mbps.

- When I unplug the LAN cable → everything becomes normal again.

 

Important observations:

 

- Before the firmware update, this issue did NOT occur.

- I have already performed a full factory reset and configured the device again in AP mode.

- I tested multiple LAN ports and the issue persists.

- I also tested with minimal devices connected, but the issue still happens.

 

Additionally, the router shows the message:

“WAN port does not support gigabit speeds”

 

I would like to clarify:

 

- Is this issue caused by a firmware bug, hardware fault, or LAN cable issue?

- Should I replace the LAN cable first?

- Or is this device eligible for warranty replacement?

 

Kindly guide me on the proper solution.

 

Joseph-TP wrote

Hello @Tanvir124 ,

Welcome to our community.

 

What if you downgrade the firmware back to the previous version? For example, 

Archer C6(EU)_V6_1.1.1 Build 20251110

 

This sounds like an unstable WAN connection that may have been triggered by the firmware update. Here are some troubleshooting steps to help resolve this:

1. Verify cable connections:
Make sure the Ethernet cable between your modem and the router is connected properly. Try replacing it with a new cable (CAT5E or higher) to rule out cable issues.

2. Change DNS servers:
Log into the web management interface of your router at http://tplinkwifi.net, then go to Advanced > Network > Internet > Advanced Settings. Change the two DNS servers to 1.1.1.1 and 8.8.8.8.

3. Test direct connection:
Connect a PC directly to your modem to verify if your ISP Internet remains stable without the router in between. This helps confirm the issue is router-related.

4. Check router placement:
Make sure the router is properly placed in an open area instead of inside a cabinet or shelf to ensure proper ventilation and avoid overheating.

5. Disable certain features:
• Go to Advanced > NAT Forwarding > UPnP and disable UPnP
• Go to Advanced > Security and disable SIP ALG
These features may sometimes affect connection stability.