Loopback IP 127.0.0.1

[jack// ani]

Hi all,

What is the purpose and use to loopback ip address 127.0.0.1??

Thanks

 

[dIgItaL_BrAt]

Loopback address is a special IP number (127.0.0.1) that is designated for the software loopback interface of a machine. The loopback interface has no hardware associated with it, and it is not physically connected to a network.The loopback interface allows IT professionals to test IP software without worrying about broken or corrupted drivers or hardware.

 

[ishaan]

see this - *en.wikipedia.org/wiki/127.0.0.1

 

[#/bin/sh]

127.0.0.1 is a loopback network connection.
This means that if you try to connect to 127.0.0.1, you are immediately looped back to your own machine.

Yeah, must see Wikipedia

 

[yrana2002]

My advice would be never to use the ping command with loopback IP. It wont' affect the fast comps today, but somehow it may eat up your resources within seconds.

 

[naveenchandran]

OK!

Then here is my question..
If 127.0.0.1 is a loop back address and ping back...

Now why does

127.0.0.2
127.0.0.3
127.0.0.4
...
...
...
127.0.0.255

Address ping?
are they also loop back addresses? if not why do they ping?

 

[sakumar79]

Hmm, did you check what is the message that you get when you ping 127.0.0.x? It is getting reply from 127.0.0.1 always... Not sure why though.

Arun

 

[__Virus__]

Not only 127.0.0.1 but u can ping any address starting with 127

Ping 127.X.X.X and u will get response.

*www.tcpipguide.com/free/t_IPReservedPrivateandLoopbackAddresses.htm

Useful.