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The router has two addresses:
  • One on the tailnet, tailscale_ips, like any machine.
  • One on the Network, customer_address, from 172.27.254.0/24. Traffic from devices behind the router enters the Network from it, so a function or host sees that address as the source, never the device’s own.
Each router on a Network gets its own customer_address, such as 172.27.254.1 and 172.27.254.2.

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For the Tailnet Admin

  • tailscale_ips are Tailscale IP addresses, shown on the router’s machine in the admin console.
  • The router uses SNAT, Tailscale’s default for subnet routers. That is why hosts on the Network see customer_address.