Re: Fw: Re: How to find the bottleneck?

[Hugo van der Kooij <hugo.van.der.kooij () qsight nl>]

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Hugo van der Kooij 
network engineer 

QSight IT 

T : +31 15 888 0 345

F : +31 15 888 0 445
E : hugo.van.der.kooij () qsight nl
I : http://www.qsight.nl

Arnhem - Delft - Veldhoven

--- Begin Message --- From: Hugo van der Kooij <hugo.van.der.kooij () qsight nl>
Date: Tue, 29 Aug 2017 13:21:54 +0000

Dennis,



It looks to me the Round Trip on the branch office is higher on average.

Which is no surprise in itself.



And as the blog indicated small issues stack up rapidly to noticeable delays.



Met vriendelijke groet / With kind regards,

Hugo



Van: Wireshark-users [mailto:wireshark-users-bounces () wireshark org] Namens 
Dennis Schneck
Verzonden: Tuesday, 29 August, 2017 10:45
Aan: wireshark-users () wireshark org
Onderwerp: [Wireshark-users] Fw: Re: How to find the bottleneck?





Hello Anne, Hello Hugo,

I tryed to get some statistics ( smb2, RTT, data usage ).





Gesendet: Montag, 28. August 2017 um 17:35 Uhr
Von: "Anne Blankert" <anne.blankert () geodan nl <mailto:anne.blankert () geodan nl> 

An: "Community support list for Wireshark" <wireshark-users () wireshark org 
<mailto:wireshark-users () wireshark org> >
Betreff: Re: [Wireshark-users] How to find the bottleneck?

* Are you sure the branch has a 1 GB/s connection to HQ? 1GB/s possible, but 
quite good for current standards.

* The network is as slow as the slowest link. Are you sure that the slowest 
link between the branch client and HQ server is 1GB/sec? If traffic is routed 
over public internet between branch and HQ, there are likely some bottlenecks 
beyond your control

* Is there network latency between branch and headquarters? Even on high 
bandwidth connections, network latency can cause low data transfer rates 
because some protocols are very chatty: the next packet is sent only after 
receiving acknowledgment for the previous packet. With high latency networks, 
this may result in sometimes very poor transfer speeds







2017-08-28 14:37 GMT+02:00 Dennis Schneck <dennisschneck () web de 
<mailto:dennisschneck () web de> >:


Hello,
the following scenario


headquarter:  Server (AIX) and client (Windows)

branch: client (Windows)




If the Clients from the branch open a project from the server in the 
headquarter
it takes about 5 times longer than the same project open in headquarters.
The bandwith from the branch is 1 GB/s for the hole company.
So OK it takes longer in the branch but 5 times.

The Data is on the Storage System.


How to find the bottleneck in the network ?
The networkadmin is sure all is fine.



made a IO Graph from "tcp.seq" from one of some sample Data I got from the 
Users



SPW = BAD = branch

SPG = GOOD = headquarter


Thanks
Dennis








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