lo(4)
NAME
lo − loop network interface
SYNTAX
pseudo-device loop
DESCRIPTION
The loop interface is a software loopback mechanism that may be used for performance analysis, software testing, and/or local communication. By default, the loopback interface is accessible at address 127.0.0.1 (nonstandard); this address may be changed with the SIOCSIFADDR ioctl.
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.