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lo(7)									 lo(7)

NAME
       lo - Software loopback network interface

SYNOPSIS
       pseudo-device loop

DESCRIPTION
       The  loopback  interface is a software loopback mechanism which is used
       for performance analysis, software testing, and/or local communication.
       As with other network interfaces, the loopback interface must have net‐
       work addresses assigned for each address family with which it is to  be
       used. These addresses may be set or changed with the SIOCSIFADDR ioctl.
       The loopback interface should be the last interface configured, as pro‐
       tocols may use the order of configuration as an indication of priority.
       The loopback should never be configured first unless no hardware inter‐
       faces exist.

NOTES
       Previous	 versions  of  the  UNIX system enabled the loopback interface
       automatically, 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.

ERRORS
       The interface was handed a  message  with  addresses  formatted	in  an
       unsuitable address family; the packet was dropped.

SEE ALSO
       Networking: inet(7), netintro(7)

									 lo(7)

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