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WSL/doc/docs/technical-documentation/localhost.md
WSL Team 697572d664 Initial open source commit for WSL. 
Many Microsoft employees have contributed to the Windows Subsystem for Linux, this commit is the result of their work since 2016.

The entire history of the Windows Subsystem for Linux can't be shared here, but here's an overview of WSL's history after it moved to it own repository in 2021:

Number of commits on the main branch: 2930
Number of contributors: 31

Head over https://github.com/microsoft/WSL/releases for a more detailed history of the features added to WSL since 2021.
2025-05-15 12:09:45 -07:00

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Localhost

localhost is a WSL2 linux process, created by mini_init. Its role is to forward network traffic between the WSL2 virtual machine, and Windows.

NAT networking

When wsl2.networkingMode is set to NAT, localhost will watch for bound TCP ports, and relay the network traffic to Windows via wslrelay.exe

Mirrored networking

In mirrored mode, localhost register a BPF program to intercept calls to bind(), and forward the calls to Windows via wslservice.exe so Windows can route the network traffic directly to the WSL2 virtual machine.

See src/linux/localhost.cpp.