Note : Do not compare PC vs cisco Devices. The nearest addresses first approach looks like this: Loopback: ping 127.0.0.1 Localhost: ping 192.168.2.200 Local router/default gateway: ping 192.168.2. show run or show ip interface give you information, what is configured on Router or Switch. by default any csico device do not have any IP address or Loopback configured, unlike PC. In addition, 127.0.0.1 allows us access to the network services running on the originating machine. 01-13-2022 10:34 AM - edited 01-13-2022 10:35 AM. So why do we need to establish a connection with the originating device? In some cases, we would want to validate the Internet Protocol (IP) stack on a device connected to the network. Minimum = 0ms, Maximum = 0ms, Average = 0ms The loopback, unspecified addresses, and the IPv6 addresses that have embedded IPv4 addresses are assigned out of the 0000 0000 binary prefix space. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Īpproximate round trip times in milli-seconds: If you turned off IPv6 it would go to the IPv4 address. I think Windows preference is to use IPv6 where possible, which is why localhost defaults to the IPv6 resolution. For example, entering the command in a command prompt window will connect with the originating device: C:\Users>ping 127.0.0.1 You should be able to ping the Loopback address from the Router, the Switch, and the PC since they all rely upon the Router to know about the address (the PC and Switch have the Router set as the Default Gateway for each of their respective subnets, and the Router 'owns' the Loopback0 address). Hostnames can resolve to both IPv4 and IPv6 addresses. 127.0.0.1 is a non-routable, private IP address used to establish a connection with the same device on which the address was entered. The loopback addresses are built into the IP domain system, enabling devices to transmit and receive the data packets. 127.0.0.1 is an IP address that is specifically assigned to the loopback interface, i.e a loopback address.
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