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IPv6 not working

IPv6 not working

IPv6 not working
IPv6 not working
2025-06-23 12:35:57
Tags: #Network Connectivity #IPv6 #Prefix
Model: Deco X20  
Hardware Version:
Firmware Version: 1.2.4

Hi everyone, I own a Deco X20 AX1800 Mesh System, and I am trying to enable IPv6 and after enabling it, the router is unable to give IPv6 Addresses on the network. The ISP supports IPv6, I have confirmed from them. The ISP's modem is on bridge mode and the main control is through PPPoE on my Deco X20. The Log is attached. I've only changed my IP address in the logs to 'xxx.xx.xxx.xx' but the actual IP address is there in the original logs, everything else is unchanged. Please help.

According to my analysis (which is not very good, I'm very basic in networking), the issue is this line:
add_ifprefix: invalid prefix length 64 + 16 + 64

But I'm not sure, and neither do I know how to resolve it. All help is appreciated!

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#1
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7 Reply
Re:IPv6 not working
2025-06-23 12:43:05

  @audacityedits 

forgot to actually add the logs ofc, here they are 😅

 

Logs

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#2
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Re:IPv6 not working
2025-06-23 15:37:03

  @audacityedits You can use Deco X20 into AP Mode.

Please & Thank You !! ❤️
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#3
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Re:IPv6 not working
2025-06-24 07:35:13

  @audacityedits 

Hi, did you use PPPoE connection for both IPV4 and IPV6?

-Have you tried to leave IPV4 on PPPoE only and set IPV6 connection type to "Bridge" mode?

 

-Or it is also suggested to manually input the PPPoE username and password again, instead of ticking "sync IPV4 account"

 

By the way, can I have your internet service provider?

 

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.
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#4
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Re:IPv6 not working
2025-06-24 07:41:16

  @ARGamingPK1 I'm aware, but I prefer using this in router mode and accessing everything from the app. 

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#5
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Re:IPv6 not working
2025-06-24 07:43:40

  @David-TP Yes, I'm using PPPoE for both.

I have not tried bridge mode, I will try that and let you know how that goes.

I have already entered the PPPoE username and password again into IPv6 instead of having "Sync IPv4 account". With that option enabled, it was even more messed up, even IPv4 couldn't connect.

My ISP is Transworld.

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#6
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Re:IPv6 not working
2025-06-24 07:45:14

  @David-TP Enabled Bridge mode, doesn't seem to change anything. Still don't get IPv6 connection on my devices.

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#7
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Re:IPv6 not working
2025-06-26 08:08:19

  @audacityedits 

Thank you very much for your time and patience.

I haven't found any IPV6 configuration-related guide on the Transworld site. Could you please help me run a simple test:

 

Then check whether the laptop can receive proper IPV4 and IPV6 addresses.

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.
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#8
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