![]() ![]() It is also recommended that the unnumbered interface points to a loopback interface since loopbacks do not fail. A server running on your local PC will be accessible at 127.0.0. TACACS+ or RADIUS can use the loopback address as a source address for AAA functions and thereby reducing the administration overhead of having to add every IP address of the router to the AAA server. will borrow the loopback 5 IP address to use it on the GigabitEthernet0/0 interface as a next hop for the neighbor. 127.0.0.1 is called the loopback address, and is the IP a computer uses to refer to itself. interface GigabitEthernet0/0 ip unnumbered loopback 5. ![]() The four numbers must be between 0 and 255, and the IP address of 0.0.0.0 and 255.255.255.255 are reserved, and are not. We can verify that the loopback interface is operating correctly by pinging it like so: SW1 ping 10.10.10.1. One is the loopback address block of 127.0.0.0/8. In addition, 127.0.0.1 allows us access to the network services running on the originating machine. On a point-to-point link, you dont always need an IP address on the routers interface but you must inform the router of this fact, using the ip unnumbered command. There are some guidelines to to how IP address can appear, though. This term has been adopted in IP networking in several ways. 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. ![]() There’s also a hostname localhost assigned to this IP address by default. We can see that the lo interface has an IP address of 127.0.0.1, with a netmask 255.0.0.0, which is equivalent to /8. Minimum = 0ms, Maximum = 0ms, Average = 0ms The eth0 is a physical ethernet interface, and the lo is our loopback interface. Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Īpproximate round trip times in milli-seconds: For example, entering the command in a command prompt window will connect with the originating device: C:\Users>ping 127.0.0.1 127.0.0.1 is a non-routable, private IP address used to establish a connection with the same device on which the address was entered. 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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