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
