Android DNS leaks #1678

New Issue

saavagebueno · 2025-11-20T06:04:38-05:00

saavagebueno commented

2025-11-20 06:04:38 -05:00

Originally created by @euh2 on GitHub (Mar 6, 2025).

Describe the problem

When using the Netbird Android app, there are DNS leaks to DNS servers from cell network provider.

To Reproduce

Steps to reproduce the behavior:

Create DNS Server in the web interface. Assign a distribution group which includes your phone.
Enable Netbird on your phone
Check for DNS leaks through your phones webbrowser
See configured DNS server/s, and DNS servers from cell network provider

Expected behavior

Netbird should block all DNS requests to servers not configured within Netbird

Are you using NetBird Cloud?

Yes

NetBird version

Phones Netbird App version 0.0.27

Is any other VPN software installed?

No

Debug output

None, yet

Screenshots

None, yet

Additional context

Add any other context about the problem here.

Have you tried these troubleshooting steps?

[ x] Checked for newer NetBird versions
[ x] Searched for similar issues on GitHub (including closed ones)
[ x] Restarted the NetBird client
Disabled other VPN software
Checked firewall settings

Originally created by @euh2 on GitHub (Mar 6, 2025). **Describe the problem** When using the Netbird Android app, there are DNS leaks to DNS servers from cell network provider. **To Reproduce** Steps to reproduce the behavior: 1. Create DNS Server in the web interface. Assign a distribution group which includes your phone. 2. Enable Netbird on your phone 3. [Check for DNS leaks](https://browserleaks.com/dns) through your phones webbrowser 4. See configured DNS server/s, **and DNS servers from cell network provider** **Expected behavior** Netbird should block all DNS requests to servers not configured within Netbird **Are you using NetBird Cloud?** Yes **NetBird version** Phones Netbird App version 0.0.27 **Is any other VPN software installed?** No **Debug output** None, yet **Screenshots** None, yet **Additional context** Add any other context about the problem here. **Have you tried these troubleshooting steps?** - [ x] Checked for newer NetBird versions - [ x] Searched for similar issues on GitHub (including closed ones) - [ x] Restarted the NetBird client - [ ] Disabled other VPN software - [ ] Checked firewall settings

saavagebueno added the feature-request client dns labels 2025-11-20 06:04:38 -05:00

saavagebueno commented

2025-11-20 06:04:39 -05:00

@1nerdyguy commented on GitHub (Mar 6, 2025):

I could be wrong here, but the DNS servers used by Netbird would only be used for domain names registered to Netbird, not for generic internet browsing or the like, unless you've setup a matching domain as ALL.

@1nerdyguy commented on GitHub (Mar 6, 2025): I could be wrong here, but the DNS servers used by Netbird would only be used for domain names registered to Netbird, not for generic internet browsing or the like, unless you've setup a matching domain as ALL.

saavagebueno commented

2025-11-20 06:04:39 -05:00

@euh2 commented on GitHub (Mar 6, 2025):

I could be wrong here, but the DNS servers used by Netbird would only be used for domain names registered to Netbird, not for generic internet browsing or the like, unless you've setup a matching domain as ALL.

This is a generic DNS server matching all requests.

@euh2 commented on GitHub (Mar 6, 2025): > I could be wrong here, but the DNS servers used by Netbird would only be used for domain names registered to Netbird, not for generic internet browsing or the like, unless you've setup a matching domain as ALL. This is a generic DNS server matching all requests.

saavagebueno commented

2025-11-20 06:04:40 -05:00

@1nerdyguy commented on GitHub (Mar 6, 2025):

Are you setup to use netbird as an exit node then, with it having highest priority in routes?

@1nerdyguy commented on GitHub (Mar 6, 2025): Are you setup to use netbird as an exit node then, with it having highest priority in routes?

saavagebueno commented

2025-11-20 06:04:40 -05:00

@euh2 commented on GitHub (Mar 6, 2025):

Are you setup to use netbird as an exit node then, with it having highest priority in routes?

This should'nt be relevant for DNS, but yes, I also use a Netbird host as exit node.

@euh2 commented on GitHub (Mar 6, 2025): > Are you setup to use netbird as an exit node then, with it having highest priority in routes? This should'nt be relevant for DNS, but yes, I also use a Netbird host as exit node.

saavagebueno commented

2025-11-20 06:04:40 -05:00

@Ghx0sty commented on GitHub (Aug 23, 2025):

I was wondering why a rewritten domain on Android wasn't working for me, from my Netbird-assigned recusive DNS server.

Turns out the DNS was leaking badly, and that was affecting name resolutions. I can't use Netbird until this is fixed!

@Ghx0sty commented on GitHub (Aug 23, 2025): I was wondering why a rewritten domain on Android wasn't working for me, from my Netbird-assigned recusive DNS server. Turns out the DNS was leaking badly, and that was affecting name resolutions. I can't use Netbird until this is fixed!

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client-ipv6-iptables

combined-migration-2

feature/use-local-keys-embedded

entire/checkpoints/v1

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pcp-support

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refactor/unexport-getserverpublickey-add-healthcheck

fix/module-check-for-posturecheck-delete

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feat/reseller-openapi-spec

client-ipv6-acl-usp

dependabot/go_modules/github.com/russellhaering/goxmldsig-1.6.0

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client-ipv6-ssh-netflow

client-ipv6-dns

client-ipv6-iface

proto-ipv6-overlay

dependabot/npm_and_yarn/proxy/web/picomatch-4.0.4

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fix/ssh-proxy-command-quoting

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dependabot/go_modules/filippo.io/edwards25519-1.1.1

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dependabot/npm_and_yarn/proxy/web/rollup-4.60.0

dependabot/npm_and_yarn/proxy/web/flatted-3.4.2

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Reference: SVI/netbird#1678