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CPSC 110-08: Computing on Mobile Phones
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Cnet provides a tool that measures the bandwidth of your Internet connection. Bandwidth is the amount of data that can be transferred over your connection per unit time. It is usually measured in kilobits per second (Kbps), thousands of bits per second, or Millibits per second (Mbps), millions of bits per second.
Akamai provides some nice visualization tools.
There are a couple of command-line tools that we can use to watch packets traveling on the Internet. But first you have to find the command line on your system:
Traceroute is a network diagnostic tool that lets you display the path that your packets take across the Internet.
$ traceroute google.com traceroute: Warning: google.com has multiple addresses; using 74.125.224.163 traceroute to google.com (74.125.224.163), 64 hops max, 52 byte packets 1 192.168.1.1 (192.168.1.1) 1.302 ms 0.919 ms 0.757 ms 2 10.4.144.1 (10.4.144.1) 8.513 ms 9.206 ms 8.140 ms 3 68.9.8.225 (68.9.8.225) 10.512 ms 10.055 ms 9.773 ms 4 ip68-9-7-65.ri.ri.cox.net (68.9.7.65) 11.274 ms 10.933 ms 11.802 ms 5 ip98-190-33-42.ri.ri.cox.net (98.190.33.42) 9.947 ms 9.830 ms 10.313 ms 6 ip98-190-33-21.ri.ri.cox.net (98.190.33.21) 13.648 ms 12.782 ms 11.729 ms 7 provdsrj01-ae3.0.rd.ri.cox.net (98.190.33.20) 11.678 ms 12.195 ms 11.936 ms 8 nyrkbprj01-ae2.0.rd.ny.cox.net (68.1.1.173) 17.775 ms 17.548 ms 17.816 ms 9 209.85.248.178 (209.85.248.178) 21.314 ms 17.731 ms 22.360 ms 10 209.85.251.88 (209.85.251.88) 18.121 ms 21.036 ms 18.488 ms 11 209.85.249.11 (209.85.249.11) 28.026 ms 55.017 ms 28.288 ms 12 66.249.95.149 (66.249.95.149) 39.955 ms 38.041 ms 50.290 ms 13 72.14.233.86 (72.14.233.86) 56.257 ms 65.504 ms 54.386 ms 14 64.233.174.142 (64.233.174.142) 98.997 ms 91.343 ms 89.584 ms 15 64.233.174.189 (64.233.174.189) 90.320 ms 89.137 ms 168.799 ms 16 72.14.236.11 (72.14.236.11) 90.281 ms 92.398 ms 100.019 ms 17 lax02s01-in-f3.1e100.net (74.125.224.163) 91.074 ms 99.050 ms 92.037 ms $
Ping is a utility to test whether a host on the Internet is reachable: that lets you display the path that your packets take across the Internet and it reports the round-trip time for messages to that host. This is sometimes called Latency, which is a measure of time in a system. For example, the amount of time it takes to send a packet from point A to point and back again.
$ ping google.com PING google.com (74.125.239.14): 56 data bytes 64 bytes from 74.125.239.14: icmp_seq=0 ttl=48 time=91.242 ms 64 bytes from 74.125.239.14: icmp_seq=1 ttl=48 time=89.957 ms 64 bytes from 74.125.239.14: icmp_seq=2 ttl=48 time=91.471 ms 64 bytes from 74.125.239.14: icmp_seq=3 ttl=48 time=90.506 ms 64 bytes from 74.125.239.14: icmp_seq=4 ttl=48 time=91.070 ms ...