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Slide1
S
kills: use ping Concepts: network transit time, command-line user interface vs. graphical user interface, prefixes for small quantities
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 License.
Ping demonstrationSlide2
Where does this topic fit?Internet conceptsApplicationsTechnology (communication)ImplicationsInternet skills
Application developmentContent creationUser skillsSlide3
Client
Server
1101101
A
cknowledge
PingSlide4
C:\Users\Larry>ping www.google.comPinging www.l.google.com [74.125.224.84] with 32 data bytes:Reply from 74.125.224.84: bytes=32 time=18ms TTL=53
Reply from 74.125.224.84: bytes=32 time=17ms TTL=53Reply from 74.125.224.84: bytes=32 time=19ms TTL=53Reply from 74.125.224.84: bytes=32 time=17ms TTL=53Ping statistics for 74.125.224.84: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds: Minimum = 17ms, Maximum = 19ms, Average = 17ms
C:\Users\Larry>
Ping Google
Why did some packets take longer than others?Slide5
C:\Users\Larry>ping www.puc.cl
Pinging www.puc.cl [146.155.99.60] with 32 bytes of data:Reply from 146.155.99.60: bytes=32 time=182ms TTL=110Reply from 146.155.99.60: bytes=32 time=180ms TTL=110Reply from 146.155.99.60: bytes=32 time=177ms TTL=110Reply from 146.155.99.60: bytes=32 time=185ms TTL=110
Ping statistics for 146.155.99.60: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),Approximate round trip times in milli-seconds: Minimum = 180ms, Maximum = 185ms, Average = 181ms
C:\Users\Larry>
Ping Catholic University, Santiago Chile
Why are these times longer than in the previous example?Slide6
Mind blowing speed
RT to Chile at around 62,000 miles per second – about 1/3 the speed of light.Slide7
Try ping yourself
Start > CommandSlide8
A command-line windowSlide9
The result
How many speed-test packets were sent?
What was the longest round trip time? The shortest? The average?What is the 74.125.224.51 in this example?Slide10
Request timed outSlide11
A windows Ping client
Which do you prefer – the Ping client with the graphical user interface or the one with the command-line user interface? WhySlide12Slide13
Speedtest.netSlide14
Prefixes for small quantities
Prefix
Meaning
Fraction
Deci
One tenth
1/10
Centi
One hundredth
1/100
Milli
One thousandth
1/1,000
Micro
One millionth
1/1,000,000
Nano
One billionth
1/1,000,000,000
Pico
One trillionth
1/1,000,000,000,000Slide15
Summary
Client
Server
1101101
A
cknowledgeSlide16
Self-study questionsWhich organization owns the host with the IP address 74.125.0.0 ?Ping
www.microsoft.com from two places, perhaps school and your home. Are the ping times the same? Explain the differences?If you measure ping time between two hosts at different times, will it always be the same? Explain your answer.Data travels very fast across the Internet, but the rate is less than the speed of light. What things slow it down?I pinged Google.com from my home and from my office. The results showed two different destination IP addresses. Can you explain that?Which do you like better, the command-line ping program that comes with Windows or the window-based program that I wrote? Why? Give at least one advantage for each.Slide17
ResourcesTo run ping from remote locations around the world, go to:http://www.traceroute.org/For more on command line versus graphical user interfaces see:
http://som.csudh.edu/fac/lpress//471/hout/misc/guivcli.htmTo test ping times and data transfer rates (upload and download):http://www.speedtest.net/For more detailed information on performance:Network Diagnotic Tool (NDT)