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Royce,
I
think you missed the point of my previous email. Ethereal is an
indispensable network management tool but it is not a
one-stop shop for network performance analysis. (It ranks second only to perl,
in the order I install software on a new PC).
Start
off by monitoring your servers, routers and switches using MRTG or whatever
network monitoring system you prefer.
* Understand which network
devices are the biggest users.
* Understand when traffic levels are
high (and check to see if the problems disappear when traffic levels are
not)
* Understand whether performance
problems are to do with errors, packet loss, congestion or (as always happens)
is an application issue nothing to do with the network.
Once
you have a fair idea of knowing *what* is wrong with your network (eg "My server
is sending tons of broadcast messages"), should you a use
Ethereal to find out *why* things are going wrong. (eg My server is
spamming ARP messages to get the MAC address of another server I removed
from the network last week).
I like
to think of Ethereal as a microscope, where as MRTG is more like a CCTV camera.
A daily scan through the CCTV TV tells whether there's a need for forensic
research using Ethereal (and Netflow/RMON2/ntop data too).
Cheers,
Alistair
Hi Alistair,
I'm sorry for my generic question. What
I'm trying to correct is 4 segments on my network that are not
performing up to snuff. The users can still get their work done,
but I know that the network is not performing well on these switches
(Cabletron/Enterasys ELS10-27s) and I would like to find the problem and
correct it. We just upgraded from a T1 to an ATM with 3MB sustained
up and down with 12MB burst and I would like all my users to be able to enjoy
this added speed, but as I mentioned these segments are showing no additional
speed improvements. Of course, these were problem segments
before the upgrade so the problem was never really the available bandwidth
that we had available. I appreciate your post and your
time. It looks like I just need to get ethereal up and
running.
Royce
----- Original Message -----
Sent: Monday, April 14, 2003 4:50
PM
Subject: RE: [Ethereal-users] Ethereal
help
Hi
Royce,
I
suspect your question wasn't quickly replied to as it was far too
generic.
Take a look at this post I made to a similar user a few
months ago. Perhaps this will help.
Alistair
Hi,
I very new with the Ethereal product and I
would like to know the best way to use it to find and eliminate
bottlenecks in my Windows 2000 network. I have 10 servers and over
1000 users. Any help would be greatly appreciated.
RLB
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Registered Office:
Marks & Spencer p.l.c
Michael House, Baker Street,
London, W1U 8EP
Registered No. 214436 in England and Wales.
Telephone (020) 7935 4422
Facsimile (020) 7487 2670
www.marksandspencer.com
Please note that electronic mail may be monitored.
This e-mail is confidential. If you received it by mistake, please let us know and then delete it from your system; you should not copy, disclose, or distribute its contents to anyone nor act in reliance on this e-mail, as this is prohibited and may be unlawful.
The registered office of Marks and Spencer Financial Services PLC, Marks and Spencer Unit Trust Management Limited, Marks and Spencer Life Assurance Limited and Marks and Spencer Savings and Investments Limited is Kings Meadow, Chester, CH99 9FB.
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