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Routing of signals back to their source
immediately and only received by that same channel. In telecommunications, loopback devices perform transmission tests of access lines from the serving switching
Loopback
Topics referred to by the same term
Loopback device may refer to: Loopback, related to electronic communication interfaces Loop device, a pseudo-device in Unix-like operating systems This
Loopback_device
Standard hostname for a networked device's loopback interface
for loopback purposes. It is used to access the network services that are running on the host via the loopback network interface. Using the loopback interface
Localhost
Unix pseudo-device
the loop device is losetup, which is part of the package util-linux. Sometimes, the loop device is erroneously referred to as loopback device, but this
Loop_device
Audio routing software
is no loss in sound quality. VAC is the audio equivalent of a MIDI loopback device such as MultiMid or Hubi, and can be used instead of "Stereo Mix" or
Virtual_Audio_Cable
Way to traverse IP address spaces without routing
"What is NAT Reflection/NAT Loopback/NAT Hairpinning?". NYC Networkers. 2014-11-09. Retrieved 2017-04-27. "NAT Loopback Routers – OpenSim" (MediaWiki)
Network_address_translation
Network using private IP addresses
addresses is the loopback interface. These addresses are private and link-local by definition since packets never leave the host device. IPv4 reserves the
Private_network
Metal device to hold papers together
motherboard header[citation needed]. One or more paper clips can make a loopback device for a RS-232 interface (or indeed many interfaces). A paper clip could
Paper_clip
Standard for serial communication
connector (see loopback). Loopback testing is often performed with a specialized DTE called a bit error rate tester (or BERT). Some synchronous devices provide
RS-232
Free software to show network usage
interface to ntop via visiting http://127.0.0.1:3000 provided the loopback device has been started (/etc/init.d/net.lo start) and the listening port
Ntop
Device that separates the carrier's wiring from the customer's
diagnostic capabilities. A very common capability provided by a smartjack is loopback, such that the signal from the telephone company is transmitted back to
Network_interface_device
Fourth version of the Internet Protocol
in common use when classful networking was practiced. For example, the loopback address 127.0.0.1 was commonly written as 127.1, given that it belongs
IPv4
Collection of Unix tools in single executable file
user name. losetup — Associate a loopback device with a file, or show current file (if any) associated with a loop device. ls — List files. lsattr — List
Toybox
Version 6 of the Internet Protocol
After omitting consecutive sections of zeros: 2001:db8::ff00:42:8329. The loopback address is defined as 0000:0000:0000:0000:0000:0000:0000:0001 and is abbreviated
IPv6
Serial cable connecting two computers
stems from the historical use of RS-232 cables to connect two teleprinter devices or two modems in order to communicate with one another; null modem communication
Null_modem
Label to identify a network interface of a computer or other network node
short representations for IPv6 addresses. For example, the localhost (loopback) address, 0:0:0:0:0:0:0:1, and the IPv6 unspecified address, 0:0:0:0:0:0:0:0
IPv6_address
Topics referred to by the same term
an abstract virtualized representation of a computer network interface Loopback interface, a virtual network interface that connects a host to itself This
Network_interface
Method for IP address allocation and routing
2001:db8:0:0:0:0:0:0 to 2001:db8:0:ffff:ffff:ffff:ffff:ffff. ::1/128 represents the IPv6 loopback address. Its prefix length is 128, which is the number of bits in the address
Classless Inter-Domain Routing
Classless_Inter-Domain_Routing
Telecommunications equipment
channel service unit (CSU) is a line bridging device for use with T-carrier, which is used to perform loopback testing; may perform bit stuffing; may also
Channel_service_unit
Application programming interface for capturing network traffic
only Administrators can sniff packets. Npcap is able to sniff and inject loopback packets (transmissions between services on the same machine) by using the
Pcap
Device used to reduce the power level of an optical signal
power bursts, may cause back reflections, may cause signal dispersion etc. Loopback fiber optic attenuator is designed for testing, engineering and the burn-in
Optical_attenuator
the ability to access Android's internally implemented Toybox, via device loopback support. Some VM/emulator apps have a fixed set of OS's or applications
Comparison of OS emulation or virtualization apps on Android
Comparison_of_OS_emulation_or_virtualization_apps_on_Android
Compressed read-only file system
is another read-only compressed file system Cloop is a compressed loopback device module for the Linux kernel e2compr provides compression for ext2 List
AXFS
Computer component that processes audio
musicians. As of 2024, sound cards are not commonly programmed with the audio loopback systems commonly called stereo mix, wave out mix, mono mix or what u hear
Sound_card
Balanced serial interface
interchange circuits are Category I, with the exception of Local Loopback (pin 18), Remote Loopback (pin 21), and Test Mode (pin 25) being Category II. TIA-530
EIA-530
Synchronous serial communication interface
Interfaces" (PDF). Texas Instruments. Retrieved 14 February 2021. "SPI Master Loopback Example". Nordic Semiconductor. Retrieved 14 February 2021. "Freescale
Serial_Peripheral_Interface
Cable with intentionally crossed wiring
other). Null modem of RS-232 Ethernet crossover cable Rollover cable A loopback is a type of degraded one-side crosslinked connection connecting a port
Crossover_cable
Hardware component that connects a computer to a network
Converged network adapter (CNA) Host adapter Intel Data Direct I/O (DDIO) Loopback interface Network monitoring interface card (NMIC) Virtual network interface
Network_interface_controller
Topics referred to by the same term
Tiktok-like social media to the Fediverse Loop (telecommunication) or loopback, sending a signal on a channel and receiving it back at the sending terminal
Loop
Early system for organizing the IPv4 address space
While the 127.0.0.0/8 network is a Class A network, it is designated for loopback and cannot be assigned to a network. Class D is reserved for multicast
Classful_network
Computer networking technique
public endpoint for every new connection. Hairpin translation creates a loopback connection between two of its own private endpoints when it recognizes
Hole_punching_(networking)
IPv4 address for multiple purposes
behavior sends packets with destination addresses of 0.0.0.0 over the loopback interface, and never sends them over the wire, the Linux kernel remains
0.0.0.0
of the Android device itself is done via either an actual local loopback to the device, or an emulation that seems to be a local loopback. Most of these
OS virtualization and emulation on Android
OS_virtualization_and_emulation_on_Android
Processes for maintaining a system
protocol are discovery, link monitoring, remote fault detection and remote loopback. Fault management and performance monitoring (ITU-T Y.1731) - Defines performance
Operations, administration, and management
Operations,_administration,_and_management
Data-network packet analyzer
Running, Connected] 2.any (Pseudo-device that captures on all interfaces) [Up, Running] 3.lo [Up, Running, Loopback] 4.bluetooth-monitor (Bluetooth Linux
Tcpdump
Address resolution protocol for proxy servers
Additional addresses (say, 10.0.0.230 – 10.0.0.240) are aliased to the loopback interface of the server (or assigned to special interfaces, the latter
Proxy_ARP
Part of a network quietly losing traffic
by forwarding packets to an illegal IP address such as 0.0.0.0, or the loopback address. Null routing has an advantage over classic firewalls since it
Black_hole_(networking)
Mechanism allowing a machine to test itself
facility. For example, IP defines a local address which is a software loopback (IP-Address 127.0.0.1, usually locally mapped to name "localhost"). Many
Built-in_self-test
may occur if bus latency is large. External loopback on a live network may cause reception of invalid loopback failure indications. Receive descriptor zero
AMD_LANCE_Am7990
Software feature removing online advertising in a web browser or application
browsers before using a DNS server to look up a domain name. By assigning the loopback address to each known ad server, the user directs traffic intended to reach
Ad_blocking
McQuaid (March 1999). Benchmarking Methodology for Network Interconnect Devices. Network Working Group. doi:10.17487/RFC2544. RFC 2544. Informational.
List_of_reserved_IP_addresses
Complete, bootable computer installation that runs directly from a CD-ROM
CDs use a compressed filesystem image, often with the cloop compressed loopback driver, or squashfs compressed filesystem, generally doubling effective
Live_CD
Computer sound card
an Audigy 2 ZS card with the following specs: Testing chain: External loopback (line-out1 - line-in3) Sampling mode: 24-bit, 96 kHz Measured values: Noise
Sound_Blaster_Audigy
Smartphone model
tool a user can run tests on the following: Accelerometer, ALS, audio loopback, camera, battery status, DTMF, gyroscope, hardware buttons, headset detection
Nokia_Lumia_900
Smartphone released in 2011
tool, a user can run tests on the following: Accelerometer, ALS, audio loopback, camera, battery status, DTMF, gyroscope, hardware buttons, headset detection
Nokia_Lumia_800
English clothing company
creative director for Sunspel between 2009 and 2014 and introduced the Loopback Sweatshirt to the collection. More recently, Sunspel has collaborated with
Sunspel
Online hacking magazine
underground. Linenoise - a collection of smaller, often more practical articles. Loopback - answers to emails received by the Phrack staff. Phrack World News - a
Phrack
Computer network routing protocol
field is commonly set to a unique IPv4 address from one of the router’s loopback interfaces. An intermediate system can have up to three NET addresses.
IS-IS
Unix-like operating system
consists of device drivers, it is clear that device drivers are a big source of trouble. For Windows XP, 85% of the crashes are due to bugs in device drivers
Minix_3
Series of video cards
multi-texturing as efficiently as older chips. Its texture units could perform a new loopback operation which allowed them to sample up to 16 textures per geometry pass
Radeon_9000_series
Technology to control access to copyrighted works and prevent unauthorized copying
protection. Asus released a soundcard which features a function called "Analog Loopback Transformation" to bypass the restrictions of DRM. This feature allows
Digital_rights_management
Sound card
music composition; ease-of-use (plug-and-play for musicians), real-time loopback-recording of the MIDI-synthesizer (with full freedom of Soundfonts, and
Sound_Blaster_Live!
Security component that augments a firewall or NAT employed in a computer network
port) to a private listening port in the 3000–5000 range on the Microsoft loopback adapter. The ALG FTP plugin then monitors/updates traffic on the FTP control
Application-level_gateway
Routing protocol for IP networks
wins. NOTE: a RID is the highest logical (loopback) IP address configured on a router, if no logical/loopback IP address is set then the router uses the
Open_Shortest_Path_First
Series of video cards
multi-texturing as efficiently as older chips. Its texture units could perform a new loopback operation which allowed them to sample up to 16 textures per geometry pass
Radeon_R300_series
Telephone company test circuit
filter could be used while listening to remove the tone at the other end. Loopback Conference call Spew Radio Inc. "Telephone "Loop Lines"". Archived from
Loop_around
Daughter card standard specifically tailored to the needs of FPGAs
peripheral connectivity. Its main focus is on supporting FPGA and FPGA SoC devices from all major manufacturers like Altera, Lattice, Microchip and Xilinx
CRUVI_FPGA_card
Logical identifier addressing a specific group of devices on a network
within the current node; this is the multicast equivalent of the unicast loopback address. ffx2::/16 224.0.0.0/24 Link-local Packets with this destination
Multicast_address
Networks. Formerly ARPANET. 127.0.0.0/8 IANA – Loopback 1981-09 127.0.0.0/8 is reserved for loopback. 224.0.0.0/8–239.0.0.0/8 Multicast 1981-09 1991-05-22
List of assigned /8 IPv4 address blocks
List_of_assigned_/8_IPv4_address_blocks
Computer manufacturer
product, many I/O devices requiring a wired loopback header connecting output to input in a particular pattern so that the device could test itself.
Computer_Automation
Maintenance purposes. This includes Maintenance State Control, Loopbacks, External Device Control, Initialization, Emergency Reconfiguration, and Process
Transaction_Language_1
Visual effects technique
datasets in near real-time and robustly work in challenging cases (e.g. loopback sequences and multiple sequences) VISCODA VooCAT Icarus (University of
Match_moving
Basic Rate Interface
120 kilobaud. The CL channel is used to request activation or deactivation of a loopback in either the NT1 or a line regenerator. In 4B3T coding, there are three
U_interface
Family of sound cards by Creative Technology
music composition; ease-of-use (plug-and-play for musicians), real-time loopback-recording of the MIDI-synthesizer (with full freedom of Soundfonts, and
Sound_Blaster
Open-source version of SCSI target
access to data storage devices by importing them via corresponding device drivers. Back-stores do not need to be physical SCSI devices. The most important
LIO_(SCSI_target)
Engineer who designs testing systems
automation to time out for any response from the UUT. Forgot to connect the loopback cables when testing a UUT with any networking interface (Ethernet/optical/etc
Test_engineer
Optimization algorithm
be considered antennas RFID-tags based on ant colony algorithms (ACO), loopback and unloopback vibrators 10×10 The ACO algorithm is used in image processing
Ant colony optimization algorithms
Ant_colony_optimization_algorithms
Content-filtering and ad blocking browser extension
simplified since the extension is not yet capable of replacing content; Loopback proxies provide this additional functionality. These methods do not detect
Adblock_Plus
Networking features introduced in Windows Vista
Data link layer (also called Framing layer) implements 802.3, 802.1, PPP, Loopback and tunnelling protocols. Each layer can accommodate Windows Filtering
Windows Vista networking technologies
Windows_Vista_networking_technologies
Advanced rotor machine by Boris Hagelin
machine designed by Crypto AG founder Boris Hagelin. Development of the device started in 1952 and lasted a decade. The machine had nine rotors, each with
HX-63
System and hardware profiling application
capabilities. Network Interfaces Profiles physical (Ethernet, Wi-Fi) and virtual (Loopback, WireGuard/OpenVPN tunnels) network adapters. Details MAC addresses, MTU
KInfoCenter
travel, tourism, insurance
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travel, tourism, insurance