lo man page on FreeBSD

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

     lo — software loopback network interface

     device loop

     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 hardware interfaces

     If the transmit checksum offload capability flag is enabled on a loopback
     interface, checksums will not be generated by IP, UDP, or TCP for packets
     sent on the interface.

     If the receive checksum offload capability flag is enabled on a loopback
     interface, checksums will not be validated by IP, UDP, or TCP for packets
     received on the interface.

     By default, both receive and transmit checksum flags will be enabled, in
     order to avoid the overhead of checksumming for local communication where
     data corruption is unlikely.  If transmit checksum generation is dis‐
     abled, then validation should also be disabled in order to avoid packets
     being dropped due to invalid checksums.

     lo%d: can't handle af%d.  The interface was handed a message with
     addresses formatted in an unsuitable address family; the packet was

     inet(4), intro(4)

     The lo device appeared in 4.2BSD.	The current checksum generation and
     validation avoidance policy appeared in FreeBSD 8.0.

BSD				March 15, 2009				   BSD

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