Tailscale's client joins one tailnet at a time. tailmux joins them all and sends each connection to the tailnet that owns it.

brew install growlyx/tap/tailmux
tailmux setup                        # add tailnets, log in
sudo brew services start tailmux     # every app can now reach every tailnet

ssh db.home, curl http://grafana.work, psql -h db.corp.internal: names and subnets from every tailnet work side by side, even when two tailnets use the same IPs.

Docs

• Install: Homebrew, service modes, without Homebrew
• Setup and config: the tailmux setup TUI and every config key
• Routing: how tailmux picks a tailnet, and what happens on conflicts
• TUN mode: proxy-free, for every app
• Proxy mode: SOCKS5, HTTP, PAC, ssh, kubectl
• Menu bar app: switches, throughput, local API
• Updates: automatic, and how to turn that off
• Development: the in-process test lab, CI, releases