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.
smime.p7s
Description: S/MIME Cryptographic Signature
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