What is a loopback cable used for
#What is a loopback cable used for software#
It may be used by network client software on a computer to communicate with server software on the same computer, viz., on a computer running a web server, pointing a web browser to the URLs or will access that computer's own web site. On Unix-like systems, the loopback interface usually has the device name lo or lo0.Ī loopback interface has several uses. The standard, officially reserved, domain name for these addresses is " localhost" (RFC 2606). IPv6 designates only a single address for this function, 0:0:0:0:0:0:0:1 (also written as ::1), having the ::1/128 prefix (RFC 3513). The most commonly used IP address on the loopback device is 127.0.0.1 for IPv4, although any address in the range 127.0.0.0 to 127.255.255.255 is mapped to it. In IPv4 this is the network with the CIDR prefix 127/8 ("this network", RFC 3330).
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Any traffic that a computer program sends to the loopback interface is immediately received on the same interface.Ĭorrespondingly, the Internet Protocol (IP) specifies a "loopback network". Any message transmitted through such a channel is immediately received by the same channel.Īll TCP/IP implementations support a "loopback device", which is a virtual network interface implemented in software only and not connected to any hardware, but which is fully integrated into the computer system's internal network infrastructure. * A communication channel with only one endpoint.
#What is a loopback cable used for Patch#
* A patch cable, applied manually or automatically, remotely or locally, that facilitates a loop-back test. Commonly called loop around when the interconnecting circuit is accessed by dialing. * A method of testing between stations (not necessarily adjacent) wherein two lines are used, with the testing being done at one station and the two lines interconnected at the distant station. * A method of performing transmission tests of access lines from the serving switching center, which method usually does not require the assistance of personnel at the served terminal.
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This is primarily intended as a means of testing the transmission or transportation infrastructure.Įxamples of applications include the following: The term loopback (sometimes spelled 'loop-back') is generally used to describe methods or procedures of routing electronic signals, digital data streams, or other flows of items, from their originating facility quickly back to the same source entity without intentional processing or modification.