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Cannot communicate between devices in different VLANs over IPV6

Cannot communicate between devices in different VLANs over IPV6

Cannot communicate between devices in different VLANs over IPV6
Cannot communicate between devices in different VLANs over IPV6
2025-05-13 19:30:47 - last edited 2025-05-14 02:59:58
Tags: #VLAN & Multi-Networks #DHCP Service #IPv6
Model: ER605 (TL-R605)  
Hardware Version: V2
Firmware Version: 2.2.5

I have setup two VLANs in ER605. One vlan has ports 2 & 3 untagged and other vlan has ports 4 & 5 untagged. I have enabled dhcpv6 on vlan1 with ip address 2001:db8:10::/64 and on vlan2 with 2001:db8:20::/64. When I connect computers to each vlan. I am not able to communicate between the devices that are in different VLANs. Is there any configuration or settings that I need to change to enable communication between two vlans over ipv6

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Re:Cannot communicate between devices in different VLANs over IPV6-Solution
2025-05-14 02:59:42 - last edited 2025-05-14 02:59:58

Hi @Weeerbro 

Thanks for posting in our business forum.

1. VLAN interface is for v4, not v6. v6 simply is not effective when you configure it. There is no relation between them.

2. v6 is a public IP address which does not relate to the NAT layer, which you might need to worry about like v4 LAN.

3. The VLAN interface itself is allowing the inter-VLAN traffic.

So the issue is not on the router but with your clients.

Commonly, the firewall on the client is not allowing unknown traffic.

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Re:Cannot communicate between devices in different VLANs over IPV6-Solution
2025-05-14 02:59:42 - last edited 2025-05-14 02:59:58

Hi @Weeerbro 

Thanks for posting in our business forum.

1. VLAN interface is for v4, not v6. v6 simply is not effective when you configure it. There is no relation between them.

2. v6 is a public IP address which does not relate to the NAT layer, which you might need to worry about like v4 LAN.

3. The VLAN interface itself is allowing the inter-VLAN traffic.

So the issue is not on the router but with your clients.

Commonly, the firewall on the client is not allowing unknown traffic.

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#2
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