testing network saturation / bandwidth / latency

[adamf at powersteeringsoftware.com (Adam Fletcher)]

Hi Josh,

Where on your network do you want to test? Are you interested in the
latency on a local network or over the internet to a specific site - in
other words, can you describe the topology of the network a little more?


Some tools to look at include using SNMP to track the bandwidth used
over time, using a tool like ntop or iptraf on a linux host that is
acting as the firewall/router/ids box, or doing simple host-to-host test
with ICMP (ping, traceroute, etc). 

If you're on a LAN I would look at the data link and the physical layer
as well - make sure your switches or NICs aren't flaking out, or a bad
cable is causing issues, or the duplex and negotiated speed is set
correctly, and so forth.



Thanks,

Adam Fletcher
Director, Information Technology
PowerSteering Software, Inc. 

-----Original Message-----
From: discuss-bounces at blu.org [mailto:discuss-bounces at blu.org] On Behalf
Of Josh Pollak
Sent: Tuesday, August 29, 2006 10:49 PM
To: discuss at blu.org
Subject: testing network saturation / bandwidth / latency

Hi,

What tool do I want to use to examine whether a network is saturated,
how
much bandwidth I have, and what my latency?

We have two computers connected together via a network and when our
applications run on separate machines they slow down noticably, even
though the data we share isn't that much, so I'm wondering if there is a
network configuration issue like router problems, etc.

I need to know how to diagnose some of that stuff, so if anyone can
point
me at tools, or where to read up on stuff, that would be good.

Thanks,

Josh


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