Solved Ping 127.0.0.1

June 1, 2005 at 18:56:08
Specs: win 2000, P3 256MB

i would like to ask what does ping 127.0.0.1 does? does it check if the network adapter (be in a LAN card or modem) is working fine or to check if thee TCP/IP driver is working fine? is ping 127.0.0.1 a h/w check or a s/w check?



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#1
June 2, 2005 at 00:38:17

http://www.ping127001.com/whyping.htm

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#2
June 2, 2005 at 05:51:51
✔ Best Answer

Address 127.0.0.1 is the test loop back address that exists on every computer. It is reserved for that purpose.

If you are having problems with your network, PING 127.0.0.1 is the first thing you do as you quite rightly say, it proves the network card and the TCP/IP software is working correctly. You will get a response from 127.0.0.1 even of the computer is not connected to anything.

I saw a T-Shirt the other day with "Theres no place like 127.0.0.1" on the front which gives you an idea of what 127.0.0.1 is.

Stuart


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#3
June 4, 2005 at 07:05:50

hai,

Almost every implementations support lookback interface.The function of loopback interface is to allow the client and server on the same host to communicate using TCP/IP. every system assigns class A 127.0.0.1 address for the loopback interface and its name as local host.

It should be remembered that if ip datagram sent to its own host's ip address as destination address, it will be given to lookback interface thus not allowing the datagram to put on to the wire.It just loopbacks to the ipinput queue.

It's nothing but its a type of echo request and echo reply ICMP message to verify the working condition of ur NIC and to check that TCP/IP works properly or not.

For practical approach download the ethernal protocol analyser s/w and select the options menu to capture the icmp packets on ur LAN. U will come to know that no icmp packet will be captured for that command i.e ping 127.0.0.1 becuase those packets will on be put on to the wire (i.e on the network or outside the NIC)

NOTE: this(protocol analyser) works only if u r on the network .

bye
take care

kskalyan


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