The two traits of coolness and uniqueness were ones that our company possesses, so it was felt that the company should have a name that reflects this. (From: Linux Documentation Project) The reason it was chosen as our company name is because PING is a really cool command and secondly, the address 127.0.0.1 is known throughout the world as the test loopback address, making it unique. Tip: The term localhost is reserved in the DNS scheme to refer to the loopback addresses. It may sometimes be written as ::1/128, as all 128 binary bits are used to denote the network portion of the address. (From: Connected: An Internet Encyclopedia) 127.0.0.1 is a Class A Address. Only one address is allocated for use for loopback purposes. Specify the loopback interface IP address or host name. It chooses the Router ID from the IP addresses of the configured and enabled interfaces. OSPF, without a specifically defined Router ID, will pick a Router ID on its own. Right-click TCP/IP Configuration, and select Utilities > Ping. The loopback interface is useful because it is an interface with an IP address which never goes down. A loopback address is an address that tells the computer not to test its connections to another computer, but to test its own basic network setup. In System i® Navigator, expand your system > Network. 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. The reason is that this address has been reserved as what is known as the loopback address. However, there is one address that cannot be used by any computer in the world, and that address is 127.0.0.1. Data packets sent on a loopback address are re-routed back to the orginating node without any alteration or modification. A computer on the network is identified by what is known as an IP address, which consists of four numbers separated by dots, such as 127.0.0.1. Loopback Address: A loopback address is a type of IP address that is used to test the communication or transportation medium on a local network card and/or for testing network applications. It is also recommended that the unnumbered interface points to a loopback interface since loopbacks do not fail. For a complete rundown of what PING is, please goto The Ping Page. 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. In brief, PING is a command that is used on computer networks to verify connections to other computers. The IPv6 - loopback address is defined as ::1/128.Why PING 127.0.0.1? Visit our online store at CafePress for items with the PING 127.0.0.1 Computer Services logo! What is PING 127.0.0.1 and why was it chosen as the name for the company?Īn excellent question! The name PING 127.0.0.1 is derived from the computer command PING. So these addresses in reality are meaningless in this context. The ping command is only showing the first reply it gets, in your case your own PC (127.0.0.1 is loopback) was the quickest. Similarly, you will get no response from 127.255.255.255. 255.255.255.255 is a broadcast address, you are sending a ping to every device on your local network and you will get a reply from every device. Also since this is a loopback a /32 would be more efficient use of address space. Indeed if you try pinging 127.0.0.0 on a PC, you will get a general failure message. one more item, the reason the loopback is not reachable is because it is a virutal interface. Now theoretically, the 127.0.0.0 and 127.255.255.255 addresses are reserved for network and broadcast respectively, however, in practice, these have no meaning in the context of the local loopback. In practice, any ping to an IP address of 127.0.0.1 all the way up to 127.255.255.254 will have a response from the local host assuming that the IP protocol stack (the interface itself, that is) is up and running. This is because these addresses refer to the local host. If you were to ping any of these addresses on any network device, you should get a response. If you still want to see an IPv4 address of a remote device in the result of the ping command, use the command below: ping hostname -4. IPv4 addresses of this form are used to refer to the host itself. The 127.0.0.0/8 address range is called the Internal host loopback address range. From WG4R3 I cant ping Lo0 and Lo1 on WG4R2 and vice and versa. IPv4 - Internal Host Loopback Address Range
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