Question

How Does PING work

Asked by: jskfan

When you have a host file or DNS, and you use PING command to ping a machine that is onlthe network or off the network, how does the communication circuit work in either case.?
for example when you ping a remote machine which is powerd off , and you have that machine hostname and IP in the DNS or in the host file, would your computer look for the record first or until it receives something from the remote machine then it looks for the record in the DNS or host file?

do you understand what I mean? I need kind of explanation about the whole process of PING command.

Thanks

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Asked On
2008-02-19 at 06:52:35ID23174437
Topic

Apple Networking

Participating Experts
4
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Comments
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Answers

 

by: 2PiFLPosted on 2008-02-19 at 06:58:12ID: 20928880

 

by: strungPosted on 2008-02-19 at 07:13:54ID: 20929036

I am not sure exactly what it is you want to know or what problem you are having. If you ping an other computer, your computer sends a packet to that computer. If that computer is connected to the network and turned on, it will receive the ping packet. If the other computer (or an intervening firewall) is not set to reject pings, the other computer will respond to the ping and let your computer know the ping was received and and your computer will recorde what the round trip time was.

 

by: GeyybeccaPosted on 2008-02-19 at 07:31:19ID: 20929270

to answer your question it really depends what command you issue when you ping

thus if you trying to ping 'computername' it will first try to resolve that name to an IP using what methods are open to it, IE DNS, WINS, host, broadcast etc it will do this BEFORE it trys to communicate with the device. If however you type ping IPADDRESS with no switches then it will simple attempt to send 4 packets to that IP address.

In reality your question is a combination of how PING works and how name resolution works

 

by: jskfanPosted on 2008-02-19 at 11:47:03ID: 20931851

if the record is still in DNS or host file and the remote computer is powered off.

then I use:

Ping -a computername
would this give me the IP address of the remoter computer, since it has a DNS record for it ??

Ping Ipaddess
would this give me the remoter computer name , since it has a DNS record for it?

 

by: strungPosted on 2008-02-19 at 11:51:54ID: 20931890

Pinging by name should give you the IP address. Pinging by IP address will not give you the name.

If you want the name from the IP address for someplace on the internet, go to http://network-tools.com/ click on the radio button beside LOOKUP and type in the IP address.

 

by: GeyybeccaPosted on 2008-02-19 at 12:11:10ID: 20932072

you use ping -a to obtain the address when pinging an IP address, you can do this for both remote and local addresses providing you have a DNS server configured on your client machine

 

by: jskfanPosted on 2008-02-19 at 12:19:52ID: 20932163

strung:
<<<Pinging by name should give you the IP address. Pinging by IP address will not give you the name. >>>

where does it get the Ip address from???? from the DNS??? if so why it doesn't get the name when you ping the IP??

 

by: strungPosted on 2008-02-19 at 12:22:26ID: 20932196

If you look at Gevybecca's post above and my reply, you will see that I was wrong and it will work both ways.

 

by: strungPosted on 2008-02-19 at 12:26:51ID: 20932229

Gevybecca is right (although ping -a appears to work even if the DNS server is not on your local machine). Learn something new every day!

 

by: strungPosted on 2008-02-19 at 12:28:06ID: 20932241

By the way, why don't you just try it yourself and see?

 

by: jskfanPosted on 2008-02-19 at 12:33:56ID: 20932300

the point of my question is what is involved during the PING operation.
if  the remote computer is powered off, and you ping it , would the PING go the DNS and retrieve any information or it will just send a request to the powered off computer and will receive a time out.
I want sort of  a Road Map of the PING command.

 

by: strungPosted on 2008-02-19 at 12:39:27ID: 20932350

I just tried pinging my home computer which is off. Ping IP address did not return a name, but ping -a IP address did return the name. Tracert IP address also returned the name.

 

by: jskfanPosted on 2008-02-19 at 13:10:52ID: 20932619

You are still missing the point of my question:
if  the remote computer is powered off, and you ping it , would the PING go to the DNS and retrieve any information or it will just send a request to the powered off computer and will receive a time out.
I want sort of  a Road Map of the PING command.

 

by: GeyybeccaPosted on 2008-02-19 at 13:17:40ID: 20932689

I believe I answered this question earlier, to clarify, if you ping a machine that is powered off.

1) ping *.*.*.* (Any ip address) packets would be sent directly to the machine in question and as the machine is switched off no reply would be received

2) Ping -a *.*.*.* (Any Ip address) providing you have a DNS server configured the name would be resolved but no reply would be received if machine is powered off

3) Ping machinename an attempt to resolve this name to an ip address would be made through any means configured be it HOST, WINS, DNS or broardcast (NOTE no requirement for name resolution is needed of the machine you are pinging) again if machine is off then while the name would be resolved to an IP address no reply would be recieved

 

by: jskfanPosted on 2008-02-21 at 06:12:50ID: 20947801

so the PING Tries to communicate with the remote machine then to DNS  or to DNS then to the remote machine?

 

by: jskfanPosted on 2008-03-01 at 09:48:59ID: 21022683

can anyone  answer this:

the PING Tries to communicate with the remote machine then to DNS  or to DNS then to the remote machine?

 

by: jskfanPosted on 2008-03-05 at 11:40:40ID: 21053637

any updates ??????

 

by: j_mcmillanPosted on 2008-04-18 at 08:36:08ID: 21386753

You cannot ping a hostname, they only exist to make life easy for us humans and are useless when generating an ICMP packet. The hostname must be resolved to an IP address through whatever available means before the ICMP echo request is generated and sent off to the target host.

20120131-EE-VQP-002

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