Home Network Community > Wi-Fi Routers > Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))
< Wi-Fi Routers

Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))

Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))

Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))
Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))
2025-10-23 04:00:30 - last edited 2 weeks ago
Tags: #IPv6 #Firmware Update
Model: Archer AX50  
Hardware Version: V1
Firmware Version: Firmware version: 1.1.1 Build 20250917 rel.63889(4555)

Hi all, 


I’m experiencing a persistent issue with my TP-Link AX50 router (Firmware version: 1.1.1 Build 20250917 rel.63889(4555)) where upload speeds are severely throttled when IPv6 is enabled.


Issue Summary:
With IPv6 enabled, upload speeds drop to near-zero regardless of device, cable, or LAN port.
Speedtest.net reports a socket error during the upload phase:
“A socket error occurred during the upload test. A firewall could be blocking the connection or the server might be having some issues.”

 

Disabling IPv6 immediately restores full upload performance (~500 Mbps), confirming the issue is IPv6-related.
Troubleshooting Steps Taken:

  • Verified 1 Gbps full duplex link on both WAN and LAN ports.
  • Swapped cables and tested multiple devices.
  • Disabled QoS, NAT is enabled, traffic monitor and antivirus are off.
  • No firmware updates available.
  • Router CPU and memory utilization are normal (35–45% CPU, 45% memory).
  • MTU verified at 1500 with no fragmentation.
  • Wireshark confirms outbound QUIC/TCP traffic stalls during IPv6 upload attempts.

 

This appears to be a firmware-level issue with IPv6 handling or NAT offload.

Can you confirm if this is a known issue, and whether a fix is planned? I’m happy to provide further diagnostics or packet captures if needed. Should I roll back to an earlier firmware version?

  5      
 
  5      
 
#1
Options
1 Accepted Solution
Re:Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))-Solution
2025-11-04 09:16:47 - last edited 2 weeks ago

Hello @ElToroBenito ,

Thanks for contacting our community.

 

For step-by-step guidance on configuring IPv6 on your router, please refer to this FAQ: How to set up an IPv6 Internet connection on the TP-Link Wi-Fi Routers?

 

May I know if your network topology diagram is as follows:

ISP modem—router )))((( client devices

(Note: — stands for wired connection,)))((( stands for wireless connection )

 

Have you changed any settings recently? In other words, did this anomaly occur after a firmware update or modification of specific settings?

If you enable IPv6, is the initial upload speed normal? Does it decrease in speed after using the network for a while?

 

If you remove the router and connect the PC (which supports IPv6) directly to the modem, can it maintain a stable speed?

 

 

Nice to Meet You in Our TP-Link Community. Check Out the Latest Posts: △Pre-release Firmware for Archer AX50 Introduces New Parental Control Features and Enhancements △Introducing AI QoS: Elevate Your Gaming Experience on the Archer GE800 Gaming Router △Connect TP-Link Archer BE550 to Germany's DS-Lite (Dual Stack Lite) Internet via WAN △Tether KidShield Test Recruitment - Safeguarding Children's Online Experience If you found the post or response helpful, please click Helpful. If an answer solves your problem, click "Recommended Solution" so that others can benefit from it.
Recommended Solution
  0  
  0  
#5
Options
5 Reply
Re:Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))
2025-10-23 04:18:01

  @ElToroBenito , I should add that for anyone else landing here - toggle the IPv6 to off, and upload speed should return to normal.

  2  
  2  
#2
Options
Re:Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))
2025-10-23 06:41:55

  @ElToroBenito @Joseph-TP 

 

  0  
  0  
#3
Options
Re:Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))-Solution
2025-11-04 09:16:47 - last edited 2 weeks ago

Hello @ElToroBenito ,

Thanks for contacting our community.

 

For step-by-step guidance on configuring IPv6 on your router, please refer to this FAQ: How to set up an IPv6 Internet connection on the TP-Link Wi-Fi Routers?

 

May I know if your network topology diagram is as follows:

ISP modem—router )))((( client devices

(Note: — stands for wired connection,)))((( stands for wireless connection )

 

Have you changed any settings recently? In other words, did this anomaly occur after a firmware update or modification of specific settings?

If you enable IPv6, is the initial upload speed normal? Does it decrease in speed after using the network for a while?

 

If you remove the router and connect the PC (which supports IPv6) directly to the modem, can it maintain a stable speed?

 

 

Nice to Meet You in Our TP-Link Community. Check Out the Latest Posts: △Pre-release Firmware for Archer AX50 Introduces New Parental Control Features and Enhancements △Introducing AI QoS: Elevate Your Gaming Experience on the Archer GE800 Gaming Router △Connect TP-Link Archer BE550 to Germany's DS-Lite (Dual Stack Lite) Internet via WAN △Tether KidShield Test Recruitment - Safeguarding Children's Online Experience If you found the post or response helpful, please click Helpful. If an answer solves your problem, click "Recommended Solution" so that others can benefit from it.
Recommended Solution
  0  
  0  
#5
Options
Re:Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))
3 weeks ago

  @Joseph-TP 

Hi Joseph, Sorry for slow reply - have been away from home.

Network: 
ONT > Router > 3 wired LAN devices & 15 Wi-Fi devices.

 

When speed testing from a PC connected with Ethernet with IPv6 enabled, the upload speed is consistently below 1 Mbit/s (usually around 500 Mbit/s). Download speeds were relatively unaffected.

 

I rolled back the firmware, and IPv6 worked fine - no other settings have changed.

  0  
  0  
#6
Options
Re:Upload Speed near zero with IPv6 – TP-Link AX50 (Firmware 1.1.1 Build 20250917 rel.63889(4555))
3 weeks ago - last edited 2 weeks ago

Hi @ElToroBenito ,

I will make sure to forward your update to the relevant technical department.

If possible, we would like to contact you via the email address you registered with, and to collect your router's backup file.

Thank you again for your feedback and support.

Nice to Meet You in Our TP-Link Community. Check Out the Latest Posts: △Pre-release Firmware for Archer AX50 Introduces New Parental Control Features and Enhancements △Introducing AI QoS: Elevate Your Gaming Experience on the Archer GE800 Gaming Router △Connect TP-Link Archer BE550 to Germany's DS-Lite (Dual Stack Lite) Internet via WAN △Tether KidShield Test Recruitment - Safeguarding Children's Online Experience If you found the post or response helpful, please click Helpful. If an answer solves your problem, click "Recommended Solution" so that others can benefit from it.
  0  
  0  
#7
Options

Information

Helpful: 5

Views: 324

Replies: 5

Tags

IPv6 Firmware Update
About Us
Press
Copyright © TP-Link Systems Inc. All rights reserved.