Josef Bacik
b0e63cbeb9
Adds envknobs to override the netstack default TCP keepalive idle time (~2h) and probe interval (75s) for forwarded connections. When a tailnet peer goes away without closing its connections (pod deleted, peer removed from the netmap, silent network partition), the forwardTCP io.Copy goroutines block until keepalive fires: the gvisor-side Read waits on a peer that will never send again, and the backend-side Read waits on a backend that is alive and idle. With the netstack default of 7200s idle + 9×75s probes, dead-peer detection takes a little over two hours. Under high-churn forwarding — many short-lived peers, or peers holding thousands of proxied connections that drop at once — stuck goroutines accumulate faster than they clear. The existing SetKeepAlive(true) at this site enables keepalive without setting the timers; the TODO above it noted "a shorter default might be better" and "might be a useful user-tunable". This makes both timers tunable without changing the defaults: unset preserves the ~2h behavior, which is the right trade-off for battery-powered peers. The two knobs are independent — setting one leaves the other at the netstack default. The options are set before SetKeepAlive(true) so the timer arms with the configured values rather than the defaults — matches the order in ipnlocal/local.go for SSH keepalive. Updates #4522 Signed-off-by: Josef Bacik <josefbacik@anthropic.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:
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- the Synology package is at https://github.com/tailscale/tailscale-synology
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- the Chocolatey packaging is at https://github.com/tailscale/tailscale-chocolatey
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