.I remote-addr
may be a hostname, an IPv4 address in dotted-quad format, or an IPv6
address in hex-and-colons format (this last obviously requires selecting
-a different delimeter character). Exactly two
+a different delimeter character). Additionally,
+.I local-port
+may be a string of the form
+.BI ? file
+to get the kernel to allocate an unused port number, and then write the
+port to the named
+.IR file .
+Exactly two
.B peer
directives must be present. The one first registered is the
.I left