John Mann's Weblog (on sng)
 

String around my finger
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I work for NIS ITS Monash University Australia.

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    Tue, 15 Nov 2005

    Optus Cable QoS - 1

    Optus Cable is asymmetric with downloads at 4-5 Mbit/s and uploads limited to 128 kbit/s. This asymmetry has strange effects on protocols which assume symmetric bandwidth.

    As a baseline, here are some results while uploading a directory full of digital photos. [ 121 pictures, 190 MB at about 1 MB per minute. ]

    [johnm@tower in]$ ping 130.194.1.1 -c 100
100 packets transmitted, 99 received, 1% packet loss, time 99390ms
rtt min/avg/max/mdev = 208.082/620.189/855.658/141.705 ms, pipe 2

    J6$ mul ping /nu=100 johnm.dyndns.org
100 packets transmitted, 89 packets received, 11% packet loss
round-trip (ms)  min/avg/max = 176/564/843

    [root@ns0a tftp]# ping -c 100 -q johnm.dyndns.org
100 packets transmitted, 95 packets received, 5% packet loss
round-trip min/avg/max/mdev = 400.331/644.053/871.804/131.181 ms

    Pinging from home PC to work seems more relyable than pinging from work to home router. The long-term smokeping stats show about a 0.5% work to home router ping loss with no other traffic.

    [ /networks | # ]