Nick Khyl
d229a06f9a
On Windows, we used to create all routes using the interface IP address as the next hop. Notably, on Windows 8 and later, the system normalizes that next hop to 0.0.0.0, resulting in an on-link route. In #12847, we stopped creating on-link subnet routes because doing so made the last IP address in the range unreachable. However, we missed a related issue. As a result, we continued specifying the interface IP address as the next hop for Tailscale IP routes. Because Windows normalizes those routes to use an unspecified next hop, the routes we read back from the system did not match the routes we expected to see. This caused unnecessary churn, with the same routes being repeatedly deleted and recreated. In this PR, we start creating on-link routes with a normalized, unspecified (all-zeroes) next hop, as required by the API. This ensures that the routes we read back match the desired routes, preventing unnecessary churn. https://web.archive.org/web/20260924154040/https://learn.microsoft.com/en-us/windows-hardware/drivers/network/mib-ipforward-row2 Fixes #21438 Reported-by: Caleb Crome <caleb.crome@flyzipline.com> Signed-off-by: Nick Khyl <nickk@tailscale.com>
Tailscale
Private WireGuard® networks made easy
Overview
This repository contains the majority of Tailscale's open source code.
Notably, it includes the tailscaled daemon and
the tailscale CLI tool. The tailscaled daemon runs on Linux, Windows,
macOS, and to varying degrees
on FreeBSD and OpenBSD. The Tailscale iOS and Android apps use this repo's
code, but this repo doesn't contain the mobile GUI code.
Other Tailscale repos of note:
- the Android app is at https://github.com/tailscale/tailscale-android
- the Synology package is at https://github.com/tailscale/tailscale-synology
- the QNAP package is at https://github.com/tailscale/tailscale-qpkg
- the Chocolatey packaging is at https://github.com/tailscale/tailscale-chocolatey
For background on which parts of Tailscale are open source and why, see https://tailscale.com/opensource/.
Using
We serve packages for a variety of distros and platforms at https://pkgs.tailscale.com.
Other clients
The macOS, iOS, and Windows clients use the code in this repository but additionally include small GUI wrappers. The GUI wrappers on non-open source platforms are themselves not open source.
Building
We always require the latest Go release, currently Go 1.27. (While we build releases with our Go fork, its use is not required.)
go install tailscale.com/cmd/tailscale{,d}
If you're packaging Tailscale for distribution, use build_dist.sh
instead, to burn commit IDs and version info into the binaries:
./build_dist.sh tailscale.com/cmd/tailscale
./build_dist.sh tailscale.com/cmd/tailscaled
If your distro has conventions that preclude the use of
build_dist.sh, please do the equivalent of what it does in your
distro's way, so that bug reports contain useful version information.
Bugs
Please file any issues about this code or the hosted service on the issue tracker.
Contributing
PRs welcome! But please file bugs. Commit messages should reference bugs.
We require Developer Certificate of
Origin
Signed-off-by lines in commits.
See commit-messages.md (or skim git log) for our commit message style.
About Us
Tailscale is primarily developed by the people at https://github.com/orgs/tailscale/people. For other contributors, see:
- https://github.com/tailscale/tailscale/graphs/contributors
- https://github.com/tailscale/tailscale-android/graphs/contributors
Legal
WireGuard is a registered trademark of Jason A. Donenfeld.