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Each function with ingress = true has a private name.
func-id-prefix is the first 10 characters of the function’s ID, as in its public URL.

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DNS Resolver

The DNS resolver on the Network answers every private name with the address of the ingress. It resolves other names as the public internet does. A WireGuard peer configuration names the resolver once the resolver is provisioned, so a peer requests a private function by name. Devices on a tailnet reach the resolver through a Tailscale Subnet Router and split DNS: see Tailscale.