LO(4) - Device Drivers Manual #
LO(4) - Device Drivers Manual
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.
OpenBSD 7.5 - April 29, 2018