This router succeeds if the `domain' being routed takes the form of an RFC 822 domain literal, that is, an IP address in dotted-quad notation enclosed in square brackets. For example, this router handles the address
root@[192.168.1.1]
by setting up delivery to the host with that IP address. If an IP literal turns out to refer to the local host, the generic self option determines what happens. The RFCs require support for domain literals, though it seems anachronistic in today's Internet. There are no private options for this router; a transport must be set using the generic transport option.
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