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The 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 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 be configured first unless no hardware interfaces
exist.
The interface was handed a message with addresses formatted
in an unsuitable address family; the packet was dropped.
The
device appeared in
Previous versions of the 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.
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