You were already at the right place of the configuration. With the internal host detection the client first tries to resolve the entered IP address. If the IP address resolves to the configured domainname the the client assumes it is in the internal network. After that the client takes the configured action: if an internal gateway is specified a connection is set up to this internal gateway (normally only for user-id of sending HIP information). If you dont have an internal gateway the client simply doesn't do anything while staying internally.
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