How do you ping a loopback address?
A loopback address is a distinct reserved IP address range that starts from 127.0.0.0 ends at 127.255.255.255 though 127.255.255.255 is the broadcast address for 127.0.0.0/8. The loopback addresses are built into the IP domain system, enabling devices to transmit and receive the data packets. The loopback address 127.0.0.1 is generally known as localhost. Show TCP/IP protocol manages all the loopback addresses in the operating system. It mocks the TCP/IP server or TCP/IP client on the same system. These loopback addresses are always accessible so that the user can use them anytime for troubleshooting TCP/IP. 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. 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. So, all the data transmitted to any of the loopback addresses as the destination address will not pop up on the network. 127.0.0.1 is the most commonly used loopback address; generally, 127.0.0.1 and localhost are functionally similar, i.e., the loopback address 127.0.0.1 and the hostname localhost; are internally mapped. Though, other loopback addresses are also accessible and can be used. IPv4 and IPv6 Loopback Addresses:
How to use the “ping” Command:
For example, as can be seen below, the outputs of four different IPv4 loopback addresses (127.0.0.0, 127.0.0.1, 127.15.90.69, and 127.255.255.255) the network and broadcast addresses are unreachable loopback addresses and IPv6 loopback address ::1. ping output for 127.0.0.0 (Network address). C:\Users\bklad>ping 127.0.0.0 Pinging 127.0.0.0 with 32 bytes of data: General failure. General failure. General failure. General failure. Ping statistics for 127.0.0.0: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), ping output for 127.0.0.1 C:\Users\bklad>ping 127.0.0.1 Pinging 127.0.0.1 with 32 bytes of data: Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 Ping statistics for 127.0.0.1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms ping output for 127.15.90.69 C:\Users\bklad>ping 127.15.90.69 Pinging 127.15.90.69 with 32 bytes of data: Reply from 127.15.90.69: bytes=32 time<1ms TTL=128 Reply from 127.15.90.69: bytes=32 time<1ms TTL=128 Reply from 127.15.90.69: bytes=32 time<1ms TTL=128 Reply from 127.15.90.69: bytes=32 time<1ms TTL=128 Ping statistics for 127.15.90.69: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms ping output for 127.255.255.255 (Broadcast address). C:\Users\bklad>ping 127.255.255.255 Pinging 127.255.255.255 with 32 bytes of data: Request timed out. Request timed out. Request timed out. Request timed out. Ping statistics for 127.255.255.255: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), ping output for ::1. C:\Users\bklad>ping ::1 Pinging ::1 with 32 bytes of data: Reply from ::1: time<1ms Reply from ::1: time<1ms Reply from ::1: time<1ms Reply from ::1: time<1ms Ping statistics for ::1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 0ms, Maximum = 0ms, Average = 0ms Advantages of loopback address:
Disadvantages:
Although
Using just the If you are an optimistic person, you can perform step 5 first. If that works, all the other steps will also work, saving you the need to test them. If your step 5 trial fails, you can go back to step 1 and start the troubleshooting process from the beginning. by updated Aug 01, 2016 What happens when you ping a loopback address?In a TCP/IP network, the loopback IP address is 127.0. 0.1, and pinging this address will always return a reply unless the firewall prevents it. The loopback address allows a network administrator to treat the local machine as if it were a remote machine. See ping, loopback plug and localhost.
What is a ping loopback test?The ping command is used to verify the internal IP configuration on a local host. This test is accomplished by using the ping command on a reserved address called the loopback (127.0. 0.1). The loopback address, 127.0. 0.1, is defined by the TCP/IP protocol as a reserved address that routes packets back to the host.
Where can I find loopback address?The loopback addresses are built into the IP domain system, enabling devices to transmit and receive the data packets. The loopback address 127.0. 0.1 is generally known as localhost. TCP/IP protocol manages all the loopback addresses in the operating system.
What is the command to ping the loopback address from a Windows command prompt?Activity 1 - Ping Loopback Address
0.1: Open a command prompt. Type ping 127.0. 0.1 and press Enter.
|