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@[111.1.1.1]
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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