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Tailscale without a central server is raw Wireguard, basically. You can do that but then you lose Tailscale's automatic NAT traversal and packet relay fallbacks for when UDP is blocked or NAT traversal fails.
Or you can self-host Tailscale with https://github.com/juanfont/headscale if you want.
As other have suggested, Nebula (https://github.com/slackhq/nebula) is pretty elegant. It has groups-based access built in which is extremely convenient.
You can bolt-on SSO fairly easily - just create a certificate signing service. I created https://github.com/unreality/nebula-mesh-admin in a weekend, so its fairly easy to add a SSO flow in.
As other have suggested, Nebula (https://github.com/slackhq/nebula) is pretty elegant. It has groups-based access built in which is extremely convenient.
You can bolt-on SSO fairly easily - just create a certificate signing service. I created https://github.com/unreality/nebula-mesh-admin in a weekend, so its fairly easy to add a SSO flow in.
All the hoop-jumping I can think of is open-source. https://github.com/tailscale/go has the Go toolchain changes for size reduction (though most get upstreamed), and the rest of the size reduction stuff comes from lazy configuration, i.e. keeping as little idle state as possible. But that's useful for memory reduction on all platforms, so it's just in the general network engine at https://github.com/tailscale/tailscale .
All the hoop-jumping I can think of is open-source. https://github.com/tailscale/go has the Go toolchain changes for size reduction (though most get upstreamed), and the rest of the size reduction stuff comes from lazy configuration, i.e. keeping as little idle state as possible. But that's useful for memory reduction on all platforms, so it's just in the general network engine at https://github.com/tailscale/tailscale .