For simple client/server testing, it is often convenient to have both client and server on the same machine, in which case the loopback interface is a convenient (and fast) standin for a “real” network interface.
Loopback delivery avoids the need to use the LAN at all, or even the need to have a LAN. Delivering packets to the loopback interface is simply a form of interprocess communication a functionally similar alternative is named pipes. On many systems, the name “localhost” resolves to the IPv4 loopback address 127.0.0.1 (the IPv6 address ::1 is also used) see 7.3 Special Addresses.
#IPV4 LOOPBACK WINDOWS 7 FULL#
In a room full of workstations each with a single Ethernet interface eth0 (or perhaps Ethernet adapter Local Area Connection), we might as well view the IP address assigned to the interface as assigned to the workstation itself.Įach of those workstations, however, likely also has a loopback interface (at least conceptually), providing a way to deliver IP packets to other processes on the same machine. In the most common case, where each node has a single LAN interface, this is a distinction without a difference. IP addresses (both IPv4 and IPv6) are, strictly speaking, assigned not to hosts or nodes, but to interfaces.
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