WSL mirror network mode is broken in the latest stable windows update
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- Dominant language
- C++
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Description
### Windows Version
Microsoft Windows [Version 10.0.26200.7623]
### WSL Version
WSL version: 2.6.3.0
### Are you using WSL 1 or WSL 2?
- [x] WSL 2
- [ ] WSL 1
### Kernel Version
Kernel version: 6.6.87.2-1
### Distro Version
Kali GNU/Linux Rolling 2025.4
### Other Software
_No response_
### Repro Steps
Running WSL with network mode set to mirror results in fail.
### Expected Behavior
Working with no issue.
### Actual Behavior
wsl: Mirrored networking mode is not supported: Windows version 26200.7623 does not have the required features.
Falling back to NAT networking.
### Diagnostic Logs
[WslNetworkingLogs-2026-01-18_12-34-22.zip](https://github.com/user-attachments/files/24694038/WslNetworkingLogs-2026-01-18_12-34-22.zip)
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing WSL 2.6.3.0 on Windows 10.0.26200.7623 with network mode set to mirror, then inspect WslNetworkingLogs-2026-01-18_12-34-22.zip. Done means mirrored networking works without the unsupported-version message or fallback to NAT networking.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- linux
- Domain
- networking, operating-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 30/100