Loopback

A loopback is a mechanism where network traffic is routed back to the originating device. It's essentially a shortcut for a device to talk to itself over a network. This is achieved using a special IP address (typically 127.0.0.1 for IPv4 or ::1 for IPv6) and a designated network interface (the loopback interface). The data never actually leaves the host, instead being internally redirected.

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• @article@Understanding the Loopback Address and Loopback Interfaces