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You can define an endpoint in 'Networks' (which aren't just networks), which allows you to override traffic arriving at your machine. This can be a single host (203.0.113.10), a network definition (203.0.113.0/24), a hostname (client.example.com), or a DDNS client (name.ddns.org). Each entry is then assigned to a zone, and traffic arriving from that endpoint is treated as being from that Zone.