Wireshark-users: Re: [Wireshark-users] WAN Capacity Planning

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From: Stephen Fisher <stephentfisher@xxxxxxxxx>
Date: Wed, 31 Jan 2007 14:14:28 -0800
On Wed, Jan 31, 2007 at 07:37:10PM -0200, Persio Pucci wrote:

> I am troubleshooting some frame-relay circuits, and looking for 
> evidences that can help me calculate a WAN upgrade on the circuits. 
> What should I be looking at (retransmissions? delay/delta?) and is 
> there any general formula to apply to those results?

The main thing to look at is bandwidth utilization when upgrading a WAN 
circuit.  Also make sure that you are doing QoS, so that your priority 
traffic (if any) such as voice/video/certain data is carried across the 
circuit with minimal delay.  QoS will of course cause non-priority 
traffic to be delayed even more so you can look at response times of 
applications/services across the WAN circuit, which is where Wireshark 
could come in.  Check our the Statistics menu to see if there is 
something applicable to your setup.  I would suggest looking at the TCP 
Stream Graphs Service Response Time sections.  The longer distance of a 
WAN circuit will make a difference in the delay.

Finally, no, there are no solid formulas to use ;)  Just compare the 
statistics when the circuit is over-utilized and not to see how bad it 
gets.  Once you start getting noticable delays, it's time to upgrade.  
That usually starts happening when bandwidth is being maxed out.


Steve