Home Network Community > Deco > Deco BE65 internet speed capped at 300 Mbps on PPPoE
< Deco

Deco BE65 internet speed capped at 300 Mbps on PPPoE

Deco BE65 internet speed capped at 300 Mbps on PPPoE

Deco BE65 internet speed capped at 300 Mbps on PPPoE
Deco BE65 internet speed capped at 300 Mbps on PPPoE
2025-07-31 13:05:49 - last edited 2025-08-11 02:32:09
Model: Deco BE65  
Hardware Version: V2
Firmware Version: 1.1.7 Build 20250324 Rel. 32980

I have two Deco BE65 units (hardware version 2.0, firmware version 1.1.7 Build 20250324 Rel. 32980)and my optical fiber internet speed is 1 Gbps. For the sake of testing speeds I have not used my second unit at all to rule out any issues with the satellite unit. My ISP has provided me with an ONT box along with EX520v router. The internet connection requires a PPPoE authentication and using VLAN ID of 20.

 

When I connect the ONT box to my ISP's EX520v router and let it handle the PPPoE and then connect Deco to the EX520v router, I get full 1 Gbps internet speeds. I have measured this both with the Deco app internet speed test and my computer connected to the Deco with a CAT-6 cable. Even my phone gets me very close to 1 Gbps speeds over wifi.

 

However, when I remove the EX520v from the setup and connect my Deco directly to the ONT box (with the same CAT-6 cable), I get a working internet connection, but consistently see speeds capped around 300 Mbps. I was able to configure PPPoE on my Deco without any issues and my ISP confirmed that VLAN ID 20 is correct. The only problem is that the speeds are capped and not reaching the full 1 Gbps.

 

Can you confirm whether the Deco BE65 has any documented PPPoE speed limitations in firmware or hardware?

I have not enabled QoS at all so that shouldn't be a factor. I'm wondering could it be that Deco negotiates the LAN speed wrong and uses 100 Mbps transfer speeds? I couldn't find a way to see the negotiated LAN speed either from the Deco app or from http://tplinkdeco.net/ management view. I have tested multiple cables, but none of them have fixed the issue. When I use the same cables to connect ONT to EX520v and then EX520v to the Deco, I always get full 1 Gbps speeds.

 

Any other ideas what could cap the speeds to around 300 Mbps when Deco is connected directly to the ONT box?

 

If I cannot solve the issue then I'll just leave EX520v to handle the PPPoE and keep my Deco in access point mode. But if possible I'd like to simplify the setup and leave out the ISP's EX520v router from the setup.

  1      
 
  1      
 
#1
Options
1 Accepted Solution
Re:Deco BE65 internet speed capped at 300 Mbps on PPPoE-Solution
2025-08-08 08:26:48 - last edited 2025-08-11 02:32:09

@David-TP I tested MAC cloning before and it didn't affect the speed. But now when I tried again to change my Deco from access point mode to router mode I couldn't get internet connection at all. I tried to boot all devices a few times, double checked the PPPoE settings, also tried to turn off MAC cloning, but always ended up with red light / no internet connection.

 

Earlier when I tested MAC cloning I also connected my desktop computer directly to the ONT box, configured the PPPoE connection, and the speed was still capped at roughly the same 300 Mbps. So I'm starting to think that this is something related to my ISP rather than the Deco BE65.

 

I'll continue to run some tests every now and then, but as I need internet quite regularly I'll keep the EX520v in the setup and Deco BE65 in access point mode for now.

Recommended Solution
  1  
  1  
#6
Options
5 Reply
Re:Deco BE65 internet speed capped at 300 Mbps on PPPoE
2025-08-01 02:57:36 - last edited 2025-08-01 03:02:47

  @myrde 

Hi, welcome to the community.

May I know your internet service provider?

Did "Test Internet Speed" on the Deco APP also report ~300mbps when the BE65 is connected directly to the ISP ONT box?

 

By the way, have you checked whether Deco BE65 got the same IPV4 internet address as EX520v when Deco is directly connected to the ONT box?

 

At the same time, I'll follow up on your case via email and ask the senior engineer for more advice.

Wait for your reply.

Best regards.

▶Check What's Currently Going on With Deco ▶Deco BE85 1.2.0 Enhanced Mesh Backhaul Stability and Device Roaming Experience ▶Deco BE65/BE65 Pro 1.2.0 Enhanced Mesh Network Stability and System Security ▶Deco BE75 1.1.0 Added WireGuard VPN, Manual Channel Selection and More Try to leave a Message if urgent help is required.
  0  
  0  
#2
Options
Re:Deco BE65 internet speed capped at 300 Mbps on PPPoE
2025-08-01 09:05:15

@David-TP thanks for the quick reply.

 

My internet service provider is DIGI (Spain). And yes, the "Test Internet Speed" in the Deco app also reported around 300 Mbps speed when BE65 was connected directly to the ISP ONT box.

 

I haven't yet checked whether BE65 and EX520v got the same IP address when connected to the ONT box. I'll check that a bit later today and get back to you.

  1  
  1  
#3
Options
Re:Deco BE65 internet speed capped at 300 Mbps on PPPoE
2025-08-04 20:39:37

@David-TP I haven't been yet able to test whether EX520v and Deco both get the same IPV4 address when connected to the ONT box. I'll try to get that done soon. Any updates from the senior engineer?

  0  
  0  
#4
Options
Re:Deco BE65 internet speed capped at 300 Mbps on PPPoE
2025-08-05 02:06:59

  @myrde 

Hi, thanks for the update.

The engineer tends to think that the ISP might assign different IP addresses to the EX520v and Deco BE65. Different IP groups correspond to various network priorities.

It is suggested to clone the MAC address of the EX520v(you should be able to find it on the product label and manually put it into Deco):

How to configure MAC Clone on Deco if Deco fails to connect to the internet

 

Wait for your reply.

Best regards.

▶Check What's Currently Going on With Deco ▶Deco BE85 1.2.0 Enhanced Mesh Backhaul Stability and Device Roaming Experience ▶Deco BE65/BE65 Pro 1.2.0 Enhanced Mesh Network Stability and System Security ▶Deco BE75 1.1.0 Added WireGuard VPN, Manual Channel Selection and More Try to leave a Message if urgent help is required.
  0  
  0  
#5
Options
Re:Deco BE65 internet speed capped at 300 Mbps on PPPoE-Solution
2025-08-08 08:26:48 - last edited 2025-08-11 02:32:09

@David-TP I tested MAC cloning before and it didn't affect the speed. But now when I tried again to change my Deco from access point mode to router mode I couldn't get internet connection at all. I tried to boot all devices a few times, double checked the PPPoE settings, also tried to turn off MAC cloning, but always ended up with red light / no internet connection.

 

Earlier when I tested MAC cloning I also connected my desktop computer directly to the ONT box, configured the PPPoE connection, and the speed was still capped at roughly the same 300 Mbps. So I'm starting to think that this is something related to my ISP rather than the Deco BE65.

 

I'll continue to run some tests every now and then, but as I need internet quite regularly I'll keep the EX520v in the setup and Deco BE65 in access point mode for now.

Recommended Solution
  1  
  1  
#6
Options

Information

Helpful: 1

Views: 336

Replies: 5

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