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Re: [OT, embarrassing] trouble understanding ping output



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Barclay, Daniel wrote:

> ghe wrote:
> ...> I have a script pinging my ISP (details below) and I don't understand
>> the results. Some output:
>>
>>>     2391  Thu Feb 26 01:14:39 2009 -- 5 packets, time 45ms == max rtt: 351.654 ms
>>>     2392  Thu Feb 26 01:14:45 2009 -- 5 packets, time 46ms == max rtt: 344.855 ms
> ...
> 
>> What I don't understand is how the maximum round trip time can be 350 ms
>> when it takes only 50 ms for the test. Can anyone explain this?
> 
> I don't know, but my first guess is that that maximum is the maximum
> during the current ping run.  

Yes, that's what I figured.

> My second is that the first time is an
> average.

I don't think so. Here's a line from the same program (changed to show a
little more data) on the same host, but with appletalk, squid, and mysql
killed -- seems to be more in line with what the router sees so far:

>       94  Thu Feb 26 11:57:00 2009 -- 5 packets, time 45ms == rtt min/avg/max: 4.853/9.993/19.244 ms

Maybe it's (average * packets) as integers?

- --
Glenn English
ghe@slsware.com

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