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Home > Archive > alt.certification.cisco > August 2003 > What is ping 127.0.0.1 for ?
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| Author |
What is ping 127.0.0.1 for ?
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| Gavin Arora 2003-07-05, 6:23 pm |
| I run across this address every now and then, could someone please tell me
what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
thanks
Gavin
| |
| Brad Ellis 2003-07-05, 8:23 pm |
| Loopback interface on your PC.
thanks,
-Brad Ellis
CCIE#5796 (R&S / Security)
Network Learning Inc
brad@eccie.com
www.ccbootcamp.com/quicklinks.html (Cisco Training)
www.routerie.com (Cisco R&S CCIE Discussion groups)
www.securityie.com (Cisco Security CCIE Discussion groups)
www.optsys.net (Cisco hardware)
Voice: 702-968-5100
FAX: 702-968-5104
"Gavin Arora" <aroraga@auburn.edu> wrote in message
news:be7itn$jb1$1@aunews.duc.auburn.edu...
> I run across this address every now and then, could someone please tell me
> what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
>
> thanks
> Gavin
>
>
| |
| JasonW 2003-07-05, 11:23 pm |
| By pinging this address, a reply tells you that your TCP/IP stack is
installed and working properly on that computer.
-JasonW
"Gavin Arora" <aroraga@auburn.edu> wrote in message
news:be7itn$jb1$1@aunews.duc.auburn.edu...
> I run across this address every now and then, could someone please tell me
> what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
>
> thanks
> Gavin
>
>
| |
| Munzir Khalid Khan 2003-07-06, 4:24 am |
| 127.0.0.1 is the loopback address in IP. Loopback is a test mechanism of
network adapters. Messages sent to 127.0.0.1 do not get delivered to the
network. Instead, the adapter intercepts all loopback messages and returns
them to the sending application. IP applications often use this feature to
test the behavior of their network interface.
As with broadcast, IP officially reserves the entire range from 127.0.0.0
through 127.255.255.255 for loopback purposes. Nodes should not use this
range on the Internet, and it should not be considered part of the normal
Class A range.
//Cheers\\
"Gavin Arora" <aroraga@auburn.edu> wrote in message
news:be7itn$jb1$1@aunews.duc.auburn.edu...
> I run across this address every now and then, could someone please tell me
> what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
>
> thanks
> Gavin
>
>
| |
| Gunnar 2003-07-09, 3:24 pm |
| just a silly question. If you got 2 nics, can you ping 127.0.0.1 and
127.0.0.2?
"Munzir Khalid Khan" <munzir@nowherefind.com> wrote in message
news:3f07d015$1@news.sahara.com.sa...
> 127.0.0.1 is the loopback address in IP. Loopback is a test mechanism of
> network adapters. Messages sent to 127.0.0.1 do not get delivered to the
> network. Instead, the adapter intercepts all loopback messages and returns
> them to the sending application. IP applications often use this feature to
> test the behavior of their network interface.
> As with broadcast, IP officially reserves the entire range from 127.0.0.0
> through 127.255.255.255 for loopback purposes. Nodes should not use this
> range on the Internet, and it should not be considered part of the normal
> Class A range.
>
> //Cheers\\
>
> "Gavin Arora" <aroraga@auburn.edu> wrote in message
> news:be7itn$jb1$1@aunews.duc.auburn.edu...
> > I run across this address every now and then, could someone please tell
me
> > what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
> >
> > thanks
> > Gavin
> >
> >
>
>
| |
| JasonW 2003-07-09, 8:24 pm |
| The NICs really never come into play when you ping 127.0.0.1, it only checks
the TCP/IP stack and the adapters are not really a part of it.
Pinging any address starting with 127 does the same thing.
-JasonW
"Gunnar" <lutcherath@chello.no> wrote in message
news:cLZOa.15923$KF1.302696@amstwist00...
> just a silly question. If you got 2 nics, can you ping 127.0.0.1 and
> 127.0.0.2?
>
>
>
> "Munzir Khalid Khan" <munzir@nowherefind.com> wrote in message
> news:3f07d015$1@news.sahara.com.sa...
> > 127.0.0.1 is the loopback address in IP. Loopback is a test mechanism of
> > network adapters. Messages sent to 127.0.0.1 do not get delivered to the
> > network. Instead, the adapter intercepts all loopback messages and
returns
> > them to the sending application. IP applications often use this feature
to
> > test the behavior of their network interface.
> > As with broadcast, IP officially reserves the entire range from
127.0.0.0
> > through 127.255.255.255 for loopback purposes. Nodes should not use this
> > range on the Internet, and it should not be considered part of the
normal
> > Class A range.
> >
> > //Cheers\\
> >
> > "Gavin Arora" <aroraga@auburn.edu> wrote in message
> > news:be7itn$jb1$1@aunews.duc.auburn.edu...
> > > I run across this address every now and then, could someone please
tell
> me
> > > what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
> > >
> > > thanks
> > > Gavin
> > >
> > >
> >
> >
>
>
| |
| MysteryWife 2003-07-18, 11:25 am |
| Also, many programs use ports associated with 127.0.0.1. Groupwise web
talks to the local groupwise server this way, or at least it did at one
time.
"Munzir Khalid Khan" <munzir@nowherefind.com> wrote in message
news:3f07d015$1@news.sahara.com.sa...
> 127.0.0.1 is the loopback address in IP. Loopback is a test mechanism of
> network adapters. Messages sent to 127.0.0.1 do not get delivered to the
> network. Instead, the adapter intercepts all loopback messages and returns
> them to the sending application. IP applications often use this feature to
> test the behavior of their network interface.
> As with broadcast, IP officially reserves the entire range from 127.0.0.0
> through 127.255.255.255 for loopback purposes. Nodes should not use this
> range on the Internet, and it should not be considered part of the normal
> Class A range.
>
> //Cheers\\
>
> "Gavin Arora" <aroraga@auburn.edu> wrote in message
> news:be7itn$jb1$1@aunews.duc.auburn.edu...
> > I run across this address every now and then, could someone please tell
me
> > what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
> >
> > thanks
> > Gavin
> >
> >
>
>
| |
| Bernie 2003-07-19, 2:24 pm |
| On Fri, 18 Jul 2003 11:01:42 -0400, "MysteryWife"
<MysteryWife@Hotmail.com> wrote:
Or you can map applications to use 127.0.0.1 and specific ports in
order to transport non-HTTP traffic over an SSL VPN connection.
>Also, many programs use ports associated with 127.0.0.1. Groupwise web
>talks to the local groupwise server this way, or at least it did at one
>time.
>
>"Munzir Khalid Khan" <munzir@nowherefind.com> wrote in message
>news:3f07d015$1@news.sahara.com.sa...
>> 127.0.0.1 is the loopback address in IP. Loopback is a test mechanism of
>> network adapters. Messages sent to 127.0.0.1 do not get delivered to the
>> network. Instead, the adapter intercepts all loopback messages and returns
>> them to the sending application. IP applications often use this feature to
>> test the behavior of their network interface.
>> As with broadcast, IP officially reserves the entire range from 127.0.0.0
>> through 127.255.255.255 for loopback purposes. Nodes should not use this
>> range on the Internet, and it should not be considered part of the normal
>> Class A range.
>>
>> //Cheers\\
>>
>> "Gavin Arora" <aroraga@auburn.edu> wrote in message
>> news:be7itn$jb1$1@aunews.duc.auburn.edu...
>> > I run across this address every now and then, could someone please tell
> me
>> > what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
>> >
>> > thanks
>> > Gavin
>> >
>> >
>>
>>
>
--Bernie
| |
|
| why ping 127.0.0.0
&
ping 127.255.255.255
not work .
best regards
deva
| |
| Zaldy de Villeres 2003-08-13, 11:25 pm |
| I got a question like this in the CCNA exam and I was thinking it is
used to test the TCP/IP, dunno if I am correct.
Brad Ellis wrote:
> Loopback interface on your PC.
>
> thanks,
> -Brad Ellis
> CCIE#5796 (R&S / Security)
> Network Learning Inc
> brad@eccie.com
> www.ccbootcamp.com/quicklinks.html (Cisco Training)
> www.routerie.com (Cisco R&S CCIE Discussion groups)
> www.securityie.com (Cisco Security CCIE Discussion groups)
> www.optsys.net (Cisco hardware)
> Voice: 702-968-5100
> FAX: 702-968-5104
> "Gavin Arora" <aroraga@auburn.edu> wrote in message
> news:be7itn$jb1$1@aunews.duc.auburn.edu...
>
>>I run across this address every now and then, could someone please tell me
>>what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
>>
>>thanks
>>Gavin
>>
>>
>
>
>
| |
| Zaldy de Villeres 2003-08-13, 11:25 pm |
| I got a question like this in the CCNA exam and I was thinking it is
used to test the TCP/IP, dunno if I am correct.
Brad Ellis wrote:
> Loopback interface on your PC.
>
> thanks,
> -Brad Ellis
> CCIE#5796 (R&S / Security)
> Network Learning Inc
> brad@eccie.com
> www.ccbootcamp.com/quicklinks.html (Cisco Training)
> www.routerie.com (Cisco R&S CCIE Discussion groups)
> www.securityie.com (Cisco Security CCIE Discussion groups)
> www.optsys.net (Cisco hardware)
> Voice: 702-968-5100
> FAX: 702-968-5104
> "Gavin Arora" <aroraga@auburn.edu> wrote in message
> news:be7itn$jb1$1@aunews.duc.auburn.edu...
>
>>I run across this address every now and then, could someone please tell me
>>what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
>>
>>thanks
>>Gavin
>>
>>
>
>
>
| |
| Adrian Penalo 2003-08-14, 2:25 am |
| That is your localhost default IP address. You can use it
to test a loop back path to your own machine.
> From: Zaldy de Villeres <lestat@zanie.ca>
> Organization: NNRP.CA
> Newsgroups: alt.certification.cisco
> Date: Wed, 13 Aug 2003 22:53:46 -0400
> Subject: Re: What is ping 127.0.0.1 for ?
>
> I got a question like this in the CCNA exam and I was thinking it is
> used to test the TCP/IP, dunno if I am correct.
>
> Brad Ellis wrote:
>> Loopback interface on your PC.
>>
>> thanks,
>> -Brad Ellis
>> CCIE#5796 (R&S / Security)
>> Network Learning Inc
>> brad@eccie.com
>> www.ccbootcamp.com/quicklinks.html (Cisco Training)
>> www.routerie.com (Cisco R&S CCIE Discussion groups)
>> www.securityie.com (Cisco Security CCIE Discussion groups)
>> www.optsys.net (Cisco hardware)
>> Voice: 702-968-5100
>> FAX: 702-968-5104
>> "Gavin Arora" <aroraga@auburn.edu> wrote in message
>> news:be7itn$jb1$1@aunews.duc.auburn.edu...
>>
>>> I run across this address every now and then, could someone please tell me
>>> what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
>>>
>>> thanks
>>> Gavin
>>>
>>>
>>
>>
>>
>
| |
| JasonW 2003-08-14, 3:25 pm |
| Yes, it tests whether the TCP/IP stack is installed correctly or not. I was
told it does not actually involve the NIC at all.
-JasonW
"Zaldy de Villeres" <lestat@zanie.ca> wrote in message
news:3F3AF9BA.3080505@zanie.ca...
> I got a question like this in the CCNA exam and I was thinking it is
> used to test the TCP/IP, dunno if I am correct.
>
> Brad Ellis wrote:
> > Loopback interface on your PC.
> >
> > thanks,
> > -Brad Ellis
> > CCIE#5796 (R&S / Security)
> > Network Learning Inc
> > brad@eccie.com
> > www.ccbootcamp.com/quicklinks.html (Cisco Training)
> > www.routerie.com (Cisco R&S CCIE Discussion groups)
> > www.securityie.com (Cisco Security CCIE Discussion groups)
> > www.optsys.net (Cisco hardware)
> > Voice: 702-968-5100
> > FAX: 702-968-5104
> > "Gavin Arora" <aroraga@auburn.edu> wrote in message
> > news:be7itn$jb1$1@aunews.duc.auburn.edu...
> >
> >>I run across this address every now and then, could someone please tell
me[co
lor=darkred]
> >>what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
> >>
> >>thanks
> >>Gavin
> >>
> >>
> >
> >
> >
>[/color]
| |
| Tao_Tzu_Fu 2003-08-27, 12:25 am |
| It's an internaal loopback test IP address. You can use it to see if your
TCP/IP has binded to the card, then you can pinr your own IP address to see
if the drivers and everything id bound to the card. ( out of 10 times, if
you can ping 127.0.0.1 and your assigned IP address then your card is
working properly.
"Zaldy de Villeres" <lestat@zanie.ca> wrote in message
news:3F3AF9BA.3080505@zanie.ca...
> I got a question like this in the CCNA exam and I was thinking it is
> used to test the TCP/IP, dunno if I am correct.
>
> Brad Ellis wrote:
> > Loopback interface on your PC.
> >
> > thanks,
> > -Brad Ellis
> > CCIE#5796 (R&S / Security)
> > Network Learning Inc
> > brad@eccie.com
> > www.ccbootcamp.com/quicklinks.html (Cisco Training)
> > www.routerie.com (Cisco R&S CCIE Discussion groups)
> > www.securityie.com (Cisco Security CCIE Discussion groups)
> > www.optsys.net (Cisco hardware)
> > Voice: 702-968-5100
> > FAX: 702-968-5104
> > "Gavin Arora" <aroraga@auburn.edu> wrote in message
> > news:be7itn$jb1$1@aunews.duc.auburn.edu...
> >
> >>I run across this address every now and then, could someone please tell
me[co
lor=darkred]
> >>what is 127.0.0.1 for and what would ping 127.0.0.1 accomplish ?
> >>
> >>thanks
> >>Gavin
> >>
> >>
> >
> >
> >
>[/color]
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