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In computer networking, localhost is a hostname that refers to the current computer used to access it. The name localhost is reserved for loopback purposes. [1] It is used to access the network services that are running on the host via the loopback network interface.
The source code is well documented in inet/tcp/tcp_fusion.c which clearly states: TCP fusion is a protocol-less data path for TCP loopback connections. The fusion of two local TCP endpoints occurs at connection establishment time. Various conditions (see details in tcp_fuse()) need to be met for fusion to be successful.
A special case of private link-local addresses is the loopback interface. These addresses are private and link-local by definition since packets never leave the host device. IPv4 reserves the entire class A address block 127.0.0.0 / 8 for use as private loopback addresses. IPv6 reserves the single address ::1.
Loopback (also written loop-back) is the routing of electronic signals or digital data streams back to their source without intentional processing or modification.It is primarily a means of testing the communications infrastructure.
The name localhost is a commonly defined hostname for the loopback interface in most TCP/IP systems, resolving to the IP addresses 127.0.0.1 in IPv4 and ::1 for IPv6.As a top-level domain, the name has traditionally been defined statically in host DNS implementations with address records (A and AAAA) pointing to the same loopback addresses.
Link-local addresses may be assigned manually by an administrator or by automatic operating system procedures. In Internet Protocol (IP) networks, they are assigned most often using stateless address autoconfiguration, a process that often uses a stochastic process to select the value of link-local addresses, assigning a pseudo-random address that is different for each session.
In Solaris/OpenSolaris, the loop device is called "loopback file interface" or lofi, [2] and located at /dev/lofi/1, etc. SunOS has the configuration program lofiadm. lofi supports read-only compression and read-write encryption. Available is also a 3rd-party driver fbk (File emulates Blockdevice), for SunOS/Solaris since summer 1988. [3]
The U interface or U reference point is a Basic Rate Interface (BRI) in the local loop of an Integrated Services Digital Network (ISDN), connecting the network terminator (NT1/2) on the customer's premises to the line termination (LT) in the carrier's local exchange, in other words providing the connection from subscriber to central office.