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Command: lo | Section: 4 | Source: OpenBSD | File: lo.4
LO(4) FreeBSD 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.
A loop interface can be created at runtime using the ifconfig loN create
command or by setting up a hostname.if(5) configuration file for
netstart(8). The lo0 interface will always exist and cannot be destroyed
using ifconfig(8).
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).
DIAGNOSTICS
lo0: can't handle afX. The interface was handed a message with addresses
formatted in an unsuitable address family; the packet was dropped.
SEE ALSO
inet(4), inet6(4), netintro(4), hostname.if(5), ifconfig(8), netstart(8)
HISTORY
The lo device appeared in 4.2BSD.
FreeBSD 14.1-RELEASE-p8 April 29, 2018 FreeBSD 14.1-RELEASE-p8