![]() When using localhost as the destination in a client connector interface of an application, the MySQL application programming interface connects to the database using a Unix domain socket, while a TCP connection via the loopback interface requires the direct use of the explicit address. The releases of the MySQL database differentiate between the use of the hostname localhost and the use of the addresses 127.0.0.1 and ::1. For example, a locally installed website may be accessed from a Web browser by the URL display its home page. The local loopback mechanism may be used to run a network service on a host without requiring a physical network interface, or without making the service accessible from the networks the computer may be connected to. ![]() If that fails, try reinstalling the driver for your NIC or replacing the NIC. Try removing and reinstalling TCP/IP on your machine. If this test produces an error, your NIC is incorrectly configured or your TCP/IP stack is corrupt. This represents the internal nature of the loopback interface and shows that connections and data that transit it are local to the host. ![]() The problem is that if I request my IP address, it might be that I get back my local loopback IP addres (127.x.x.x), not the network (ethernet) IP address. That is, if a user is pinging a loopback address, they’ll get the reply from the same TCP/IP stack running on their computer. For a communication between two hosts, I need to send the IP address of my host to the other site. You can also type the command ping localhost to achieve the same result, or you can even ping any other legal IP address with the form 127.x.y.z. Whenever a protocol or program sends any data from a computer with any loopback IP address, that traffic is processed by a TCP/IP protocol stack within itself, i.e., without transmitting it to the network. To test whether TCP/IP is installed correctly on a machine running Microsoft Windows, type ping 127.0.0.1 at the command prompt. The loopback address is used to route outgoing IP packets to the TCP/IP protocol stack bound to the network interface card (NIC) and back to the source application without actually placing the packets on the network. In TCP/IP networking, Loopback Address is the special IP address 127.0.0.1.
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