Manual Page Result
0
Command: lo | Section: 7 | Source: Digital UNIX | File: lo.7.gz
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 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 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 au-
tomatically, using a nonstandard Internet address (127.1). Use of that
address is now discouraged; a reserved host address for the local net-
work should be used instead.
ERRORS
The interface was handed a message with addresses formatted in an un-
suitable address family; the packet was dropped.
RELATED INFORMATION
Files: netintro(7), inet(7), ns(7) delim off
lo(7)