Thanks Lee, if we ever have to choose up sides I want you on my team!! John
On Dec 19, 2010, at 4:18 PM, Lee Larson wrote: > On 12/18/2010 11:59 PM, John Robinson wrote: >> >> All this gave a rating of "A", first A in my life. I understand I didn't >> lose any packets but just what in the world is the "ping" and of all things >> the "jitter". >> >> What are the last two testing, what is good or bad. >> > > For ping, think of all the submarine movies you're ever seen. It's sort of > like sonar. Your machine fires several chunks of data called ICMP packets at > a target and the target sends a response, like an echo. Your machine times > the round trip and gives the time in milliseconds. > > Most of the time this is done from the terminal with the ping command. Here's > what I see when I ping the machine hosting this list from home > > l...@bilbo:~$ ping erdos.math.louisville.edu > PING erdos.math.louisville.edu (136.165.82.1) 56(84) bytes of data. > 64 bytes from erdos.math.louisville.edu (136.165.82.1): icmp_req=1 ttl=54 > time=27.0 ms > 64 bytes from erdos.math.louisville.edu (136.165.82.1): icmp_req=2 ttl=54 > time=26.6 ms > 64 bytes from erdos.math.louisville.edu (136.165.82.1): icmp_req=3 ttl=54 > time=27.3 ms > 64 bytes from erdos.math.louisville.edu (136.165.82.1): icmp_req=4 ttl=54 > time=28.8 ms > 64 bytes from erdos.math.louisville.edu (136.165.82.1): icmp_req=5 ttl=54 > time=29.7 ms > > > Jitter is a little more complicated. It uses some statistics to measure the > variability in the time it takes packets to travel across the network. It's > also called packet delay variation, which is a lot more descriptive. > > > > _______________________________________________ > MacGroup mailing list > [email protected] > http://www.math.louisville.edu/mailman/listinfo/macgroup
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