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BSD 2.11 - man page for lo (bsd section 4)

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LO(4)											    LO(4)

NAME
       lo - software loopback network interface

SYNOPSIS
       /sys/conf/SYSTEM:
	    NLOOP     1    # loop-back pseudo-device

DESCRIPTION
       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.
       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 config-
       ured first unless no hardware interfaces exist.

DIAGNOSTICS
       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.

SEE ALSO
       intro(4N), inet(4F), ns(4F)

BUGS
       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.

3rd Berkeley Distribution		  August 1, 1987				    LO(4)
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