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OpenDarwin 7.2.1 - man page for lo (opendarwin section 4)

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LO(4)				   BSD Kernel Interfaces Manual 			    LO(4)

     lo -- software loopback network interface


     The loop interface is a software loopback mechanism which may be used for performance analy-
     sis, software testing, and/or local communication.  As with other network interfaces, the
     loopback interface must have network addresses assigned for each address family with which
     it is to be used.	These addresses may be set or changed with the SIOCSIFADDR ioctl(2).  The
     loopback interface should be the last interface configured, as protocols may use the order
     of configuration as an indication of priority.  The loopback should never be configured
     first unless no hardware interfaces exist.

     lo%d: can't handle af%d.  The interface was handed a message with addresses formatted in an
     unsuitable address family; the packet was dropped.

     intro(4), inet(4), ns(4)

     The lo device appeared in 4.2BSD.

     Previous versions of the system enabled the loopback interface automatically, using a non-
     standard Internet address (127.1).  Use of that address is now discouraged; a reserved host
     address for the local network should be used instead.

4.2 Berkeley Distribution		   June 5, 1993 		4.2 Berkeley Distribution
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