RE: Ethereal timings vs ping timings

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

This email (including any attachments) is intended only for the use of
the individual or entity named above and may contain information that is
confidential, proprietary or privileged. If you are not the intended
recipient, please notify HP immediately by return email and then delete
the email, destroy any printed copy and do not disclose or use the
information in it.


-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Anis BEN
ABDALLAH
Sent: Monday, 12 June 2006 8:20 PM
To: [email protected]
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

_______________________________________________
Ethereal-dev mailing list
[email protected]
http://www.ethereal.com/mailman/listinfo/ethereal-dev