[GH-ISSUE #4074] Error configuring IPv6 nameservers #8478

New Issue

saavagebueno · 2026-08-05T01:18:11-04:00

saavagebueno commented

2026-08-05 01:18:11 -04:00

Originally created by @amongonz on GitHub (Jun 30, 2025).
Original GitHub issue: https://github.com/netbirdio/netbird/issues/4074

Describe the problem

Trying to add an IPv6 nameserver (e.g. Cloudflare) results in invalid address strings, with the following output from netbird status -d:

Nameservers: 
  [2606:4700:4700::1111:53, 2606:4700:4700::1001:53] for [.] is Unavailable, reason: 2 errors occurred:
        * with udp: dial udp: address 2606:4700:4700::1111:53: too many colons in address
        * with udp: dial udp: address 2606:4700:4700::1001:53: too many colons in address

To Reproduce

Steps to reproduce the behavior:

Add an IPv6 nameserver to a group from the NetBird dashboard.
Run netbird status -d on a group peer.

Expected behavior

The address strings are formatted and configured correctly. Presumably, the output should have been [2606:4700:4700::1111]:53 and [2606:4700:4700::1001]:53.

Are you using NetBird Cloud?

Yes.

NetBird version

0.49.0

Is any other VPN software installed?

No.

Additional context

A similar issue was already closed as completed in the past, https://github.com/netbirdio/netbird/issues/2327.

Have you tried these troubleshooting steps?

Reviewed client troubleshooting (if applicable)
Checked for newer NetBird versions
Searched for similar issues on GitHub (including closed ones)
Restarted the NetBird client
Disabled other VPN software (N/A)
Checked firewall settings (N/A)

Originally created by @amongonz on GitHub (Jun 30, 2025). Original GitHub issue: https://github.com/netbirdio/netbird/issues/4074 **Describe the problem** Trying to add an IPv6 nameserver (e.g. Cloudflare) results in invalid address strings, with the following output from `netbird status -d`: ``` Nameservers: [2606:4700:4700::1111:53, 2606:4700:4700::1001:53] for [.] is Unavailable, reason: 2 errors occurred: * with udp: dial udp: address 2606:4700:4700::1111:53: too many colons in address * with udp: dial udp: address 2606:4700:4700::1001:53: too many colons in address ``` **To Reproduce** Steps to reproduce the behavior: 1. Add an IPv6 nameserver to a group from the NetBird dashboard. 2. Run `netbird status -d` on a group peer. **Expected behavior** The address strings are formatted and configured correctly. Presumably, the output should have been `[2606:4700:4700::1111]:53` and `[2606:4700:4700::1001]:53`. **Are you using NetBird Cloud?** Yes. **NetBird version** 0.49.0 **Is any other VPN software installed?** No. **Additional context** A similar issue was already *closed as completed* in the past, https://github.com/netbirdio/netbird/issues/2327. **Have you tried these troubleshooting steps?** - [x] Reviewed [client troubleshooting](https://docs.netbird.io/how-to/troubleshooting-client) (if applicable) - [x] Checked for newer NetBird versions - [x] Searched for similar issues on GitHub (including closed ones) - [x] Restarted the NetBird client - [x] Disabled other VPN software (N/A) - [ ] Checked firewall settings (N/A)

saavagebueno added the bug ipv6 client dns labels 2026-08-05 01:18:11 -04:00

saavagebueno commented

2026-08-05 01:18:11 -04:00

@nazarewk commented on GitHub (Jun 30, 2025):

NetBird doesn't support internal IPv6 addressing or routing yet, please follow https://github.com/netbirdio/netbird/issues/46

I believe the linked issue was related to establishing external connections to IPv6 addresses, which does work right now.

I'm closing on behalf of https://github.com/netbirdio/netbird/issues/46 , but will reopen if you believe it's something else.

@nazarewk commented on GitHub (Jun 30, 2025): NetBird doesn't support internal IPv6 addressing or routing yet, please follow https://github.com/netbirdio/netbird/issues/46 I believe the linked issue was related to establishing external connections to IPv6 addresses, which does work right now. I'm closing on behalf of https://github.com/netbirdio/netbird/issues/46 , but will reopen if you believe it's something else.

saavagebueno commented

2026-08-05 01:18:11 -04:00

@amongonz commented on GitHub (Jun 30, 2025):

The IPs in the example are Cloudflare's public nameservers, which are external, and I'm not using an exit node. I woudn't expect this setup to route internally for DNS, although I'm not familiar with netbird yet.

If this use case weren't supported, I guess I'd still be surprised to see the cloud dashboard validate the IPv6 addresses for the nameservers. Between that and the visible error being that the host part lacks brackets, I had assumed it was a client bug.

@amongonz commented on GitHub (Jun 30, 2025): The IPs in the example are Cloudflare's public nameservers, which are external, and I'm not using an exit node. I woudn't expect this setup to route internally for DNS, although I'm not familiar with netbird yet. If this use case weren't supported, I guess I'd still be surprised to see the cloud dashboard validate the IPv6 addresses for the nameservers. Between that and the visible error being that the host part lacks brackets, I had assumed it was a client bug.

saavagebueno commented

2026-08-05 01:18:11 -04:00

@nazarewk commented on GitHub (Jun 30, 2025):

thanks for clarification, I have asked the dev team about it. It might be a quick fix, but could also be something larger that would need to wait for #46 to be addressed.

@nazarewk commented on GitHub (Jun 30, 2025): thanks for clarification, I have asked the dev team about it. It might be a quick fix, but could also be something larger that would need to wait for #46 to be addressed.

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Reference: DYNR/netbird#8478