Man page of lo
Section: Environments, Tables, and Troff Macros (7)
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lo - Software loopback network interface
interface is a software loopback mechanism which is
used for performance analysis, software testing, and/or local
As with other network interfaces, the loopback interface must have
network addresses assigned for each address family with which it is to be used.
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
Previous versions of the UNIX system enabled the loopback interface
automatically, using a nonstandard Internet address (127.1).
Use of that address is now discouraged; a reserved host address
for the local network should be used instead.
The interface was handed
a message with addresses formatted in an unsuitable address
family; the packet was dropped.
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using the manual pages.
Time: 02:40:18 GMT, October 02, 2010