tailmix: Connect to Multiple Tailnets at Once

Tailscale, a versatile networking tool utilized for various applications from homelab setups to enterprise infrastructures, faces challenges when connecting to multiple tailnets simultaneously due to its independent allocation of IPv4 addresses in each tailnet, which can lead to address conflicts. The author expresses frustration with the need to manually switch tailnets, disrupting existing connections and requiring administrative permissions to share nodes across tailnets. To address this, the author developed an open-source client called tailmix, which allows a single machine to connect to multiple tailnets by using tsnet.Server instances and a single TUN interface to assign unique IPv4 addresses from a local pool, leveraging MagicDNS for routing. This solution enables seamless connectivity across tailnets without the need to implement new policies, maintaining separate identities and policies for each tailnet while eliminating the need to switch manually.

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