Login | My status | RSS | RSS |
Tuesday, January 6, 2009
vfowler blog
choose life
  • Chronicles


  • Categories

    Art Books digital DVD Education Employment English Environment Events Food and Drink Love Music overseas Photo and Video Sport and Recreation Technology Travel


  • Tags

    Australia beer birthday Chinese CHN11 CIS13 coffee communication commuting email fashion festivals Japanese language NET11 NET12 NET26 overseas REA11 transport wine WWW

  • Skippy hops

    Choose a route, any route:
    router paths

    A trace route from the network-tools.com site (in the U.S.A.) to curtin.edu.au yields the following results.

    134.7.179.53 is from Australia(AU) in region Oceana

    TraceRoute to 134.7.179.53 [curtin.edu.au]
    Hop (ms) (ms) (ms) IP Address Host name
    1 38 48 39 72.249.0.65 -
    2 81 56 55 206.123.64.22 -
    3 46 33 15 216.52.189.9 border4.g3-2.colo4dallas-3.ext1.dal.pnap.net
    4 11 9 28 216.52.191.103 core1.tge5-2-bbnet2.ext1.dal.pnap.net
    5 19 17 10 144.228.250.113 sl-st20-dal-8-2-1.sprintlink.net
    6 23 15 28 144.232.20.82 sl-crs2-fw-0-15-3-0.sprintlink.net
    7 100 58 58 144.232.19.196 -
    8 42 52 110 144.232.0.120 sl-gw28-ana-1-0-0.sprintlink.net
    9 162 93 75 144.223.30.26 sl-aarne-46055-0.sprintlink.net
    10 226 246 228 202.158.194.77 so-3-1-0.bb1.b.syd.aarnet.net.au
    11 272 230 239 202.158.194.33 so-2-0-0.bb1.a.mel.aarnet.net.au
    12 251 242 237 202.158.194.17 so-2-0-0.bb1.a.adl.aarnet.net.au
    13 267 268 272 202.158.194.5 so-0-1-0.bb1.a.per.aarnet.net.au
    14 284 261 273 202.158.198.178 gigabitethernet0.er1.curtin.cpe.aarnet.net.au
    15 270 273 278 202.158.198.186 gw1.er1.curtin.cpe.aarnet.net.au
    16 292 308 288 134.7.16.46 te2-4-b309-cr.net.curtin.edu.au
    17 275 277 277 134.7.248.65 te1-1.b309-sr.net.curtin.edu.au
    18 287 259 263 134.7.179.53 -

    Trace complete

    How many ‘hops’ are there? There are 18 hops in total.

    What is the average time in milliseconds from the tools site to the Curtin server? Summing up each of the attempts we get 2946, 2745, and 2773 milliseconds. So the average is 2821milliseconds, or simply almost 3 seconds. Pretty quick considering it’s around 17,000 kilometres according to my Google Earth measurement - I’m sure that’s a straight line through the centre of the earth - beat that Jules Verne!

    The IP number of the hostname curtin.edu.au appears to be 134.7.179.53

    chart of a traceroute to curtin.edu.au

    Here’s a good question: As shown in the results above, time for each of the 3 attempts is not cumulative from hop to hop. However there is a general trend of increasing time per hop from first to last. From what I understand, there are 3 factors determining the hop time:

    • physical connecting medium eg. copper, fibre optic
    • geographic distance
    • router responsiveness and busyness

    No combination of these factors (that I can think of) can explain this general trend.

    From the command line of my computer here, I tried a tracert curtin.edu.au

    tracert

    This was quicker than results from network-tools.com, naturally because we stayed within the geography of Australia. However the number of hops from Melbourne to Perth, 17, is almost identical to that from the U.S.A. Also a general trend of increasing time for later hops exists in both journeys. Why? Is the kangaroo getting tired from the long route?

    Post meta

    Posted by Vernon Fowler,

    on Thursday, June 12th, 2008 11:46 pm,

    in Education, Technology

    with tags

    One Response

    1. Glen Turner said:

      Hi, I’m a network engineer with AARNet.

      I’d say your traceroute show cumulative totals, not per-hop totals.

      Cheers, Glen

    Leave a Comment

    Please note: Comment moderation is enabled and may delay your comment. There is no need to resubmit your comment.

    Subscribe without commenting