The IP address range 127.0.0.0 – 127.255.255.255 is reserved for loopback, i.e. a
Host’s self-address, also known as localhost address. This loopback IP address is
managed entirely by and within the operating system. Loopback addresses enable the
Server and Client processes on a single system to communicate with each other. When a
process creates a packet with destination address as loopback address, the operating
system loops it back to itself without having any interference of NIC.
Data sent on loopback is forwarded by the operating system to a virtual network
interface within operating system. This address is mostly used for testing purposes like
client-server architecture on a single machine. Other than that, if a host machine can
successfully ping 127.0.0.1 or any IP from loopback range, implies that the TCP/IP
software stack on the machine is successfully loaded and working.
Host’s self-address, also known as localhost address. This loopback IP address is
managed entirely by and within the operating system. Loopback addresses enable the
Server and Client processes on a single system to communicate with each other. When a
process creates a packet with destination address as loopback address, the operating
system loops it back to itself without having any interference of NIC.
Data sent on loopback is forwarded by the operating system to a virtual network
interface within operating system. This address is mostly used for testing purposes like
client-server architecture on a single machine. Other than that, if a host machine can
successfully ping 127.0.0.1 or any IP from loopback range, implies that the TCP/IP
software stack on the machine is successfully loaded and working.
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