I have seen this problem with the Windows ping in the past. The first
ping always gives a very high response time compared to subsequent ones.
ping MMM.NNN.50.1
PING MMM.NNN.50.1 (16.145.50.1): 56 data bytes
64 bytes from MMM.NNN.50.1: icmp_seq=0 ttl=255 time=73 ms
64 bytes from MMM.NNN.50.1: icmp_seq=1 ttl=255 time=0 ms
64 bytes from MMM.NNN.50.1: icmp_seq=2 ttl=255 time=1 ms
64 bytes from MMM.NNN.50.1: icmp_seq=3 ttl=255 time=1 ms
64 bytes from MMM.NNN.50.1: icmp_seq=4 ttl=255 time=0 ms
----MMM.NNN.50.1 PING Statistics----
5 packets transmitted, 5 packets received, 0.0% packet loss
round-trip (ms) min/avg/max/med = 0/15/73/1
I believe that is an internal Windows issue (something to do with the
delay of loading the ICMP.dll) and not related to actual time-of-flight
of the ICMP echo.
When I have used windows ping in doing doing network analysis from
scripts I either disregard the first response (or use another ping
program!)
Martin Visser
Technology Consultant
Consulting & Integration
Technology Solutions Group - HP Services
410 Concord Road
Rhodes NSW 2138
Australia
Mobile: +61-411-254-513
Fax: +61-2-9022-1800
E-mail: martin.visserAThp.com
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-----Original Message-----
From: ethereal-dev-bounces@xxxxxxxxxxxx
[mailto:ethereal-dev-bounces@xxxxxxxxxxxx] On Behalf Of Anis BEN
ABDALLAH
Sent: Monday, 12 June 2006 8:20 PM
To: ethereal-dev@xxxxxxxxxxxx
Subject: [Ethereal-dev] Ethereal timings vs ping timings
Hello,
I'm testing an embedded ethernet device and when trying with the ping
command, I have a different timings between reply timings indicated by
the ping command in the dos window and timings indicated in the ethereal
(time delta from previous packet)
For example for the first reply I got "time = 9ms" in dos window while
in ethereal I have "time delta from previous packet = 0.00055 s"
Why this difference?
Thanks for your help.
Anis
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