lo man page on 4.4BSD

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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 analysis, 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

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

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

     The lo device appeared in 4.2BSD.

     Previous versions of the system enabled the loopback interface automati‐
     cally, using a nonstandard 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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