[PLUG] Transcontinental ping times? for distributed symphonies

[Mike Neal]

Hi,

Just curious, how does this breakdown?  Is it mostly fibre 
propagation?  The speed of light
is about 300000 km/s _in a vacuum but it's slower in fibre and varies by 
media and mode.  Portland to the New Jersey shore is just under 2500 miles 
but that's line of sight and the cable is anything but.  Then there's the 
delay between telling bash to get the ping utility and the photons or 
electrons coming out of the NIC as well as the lag for the service at the 
other end.  There must be lots of physical layer devices along the path to 
amplify the signal.  What else?

TIA,
Mike

    At 11:04 AM 9/8/2004 -0700, you wrote:
>On Wed, Sep 08, 2004 at 10:22:15AM -0700, Keith Lofstrom wrote:
> >
> > This isn't a Linux question, but I'm sure somebody here knows somebody
> > who knows the answer.
> >
> > Question:  With fast machines at each end, and fat pipes running close
> > to the main internet hubs, what is the fastest ping times seen running
> > from coast to coast?
>
>Is New Jersey close enough to the east coast for you?
>
>
>[mrasmuss at sawmill mrasmuss]$ ping -c 5 10.42.116.13
>PING 10.42.116.13 (10.42.116.13) 56(84) bytes of data.
>64 bytes from 10.42.116.13: icmp_seq=1 ttl=254 time=66.2 ms
>64 bytes from 10.42.116.13: icmp_seq=2 ttl=254 time=66.1 ms
>64 bytes from 10.42.116.13: icmp_seq=3 ttl=254 time=66.4 ms
>64 bytes from 10.42.116.13: icmp_seq=4 ttl=254 time=66.7 ms
>64 bytes from 10.42.116.13: icmp_seq=5 ttl=254 time=66.1 ms
>
>--- 10.42.116.13 ping statistics ---
>5 packets transmitted, 5 received, 0% packet loss, time 4044ms
>rtt min/avg/max/mdev = 66.189/66.365/66.762/0.269 ms
>[mrasmuss at sawmill mrasmuss]$ traceroute -n 10.42.116.13
>traceroute to 10.42.116.13 (10.42.116.13), 30 hops max, 38 byte packets
>  1  10.41.63.10  0.399 ms  0.237 ms  0.275 ms
>  2  10.42.116.13  66.177 ms *  66.133 ms
>[mrasmuss at sawmill mrasmuss]$
>
>The link is a fractional OC3, routers at both ends are Cisco enterprise
>class.  No firewalls involved.
>
>
>--
>     Michael Rasmussen, Portland Oregon
>   Be appropriate && Follow your curiosity
>  http://meme.patch.com/memes/BicycleRiding
>    Get Fixed:  http://www.dampfixie.org
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>
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