lo(7) [osf1 man page]

lo(7)							 Miscellaneous Information Manual						     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 communica-
       tion.  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 con-
       figured, 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.

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.

RELATED INFORMATION

       Networking: inet(7), netintro(7).  delim off

																	     lo(7)

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

NAME

     lo -- software loopback network interface

SYNOPSIS

     pseudo-device loop

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(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 hard-
     ware interfaces exist.

     The loopback interface lo0 is created at boottime, it always exists and cannot be destroyed with ifconfig(8).  Additional loopback interfaces
     can be created by using the ifconfig(8) create command.

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

     inet(4), intro(4), ifconfig(8)

HISTORY

     The lo device appeared in 4.2BSD.

BUGS

     Previous versions of the 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.

BSD
								 September 3, 2006							       BSD