Hhmmmmm......
Are these hubs daisy chained?
Does the noticeable slowdown happen al the time, or can you isolate it to
particular times of day?
Do you have an internet connection?
Do you have anyone using any kind of dial up to an external service of some
kind?
Have people set up their own little Windows networking networks, in addition
to your network - file and print sharing stuff?
Are people having to print a lot of things they weren't doing before?
Story time:
Back at the brokerage firm, there was an occasion where my help desk started
getting calls about the network being down. In general, this kind of
complaint could be attributed to not being logged on to the network, and
usually we would blow off the callers with the instruction to log on. Well,
upon thinking about the fact that people who were complaining were in many
cases "good" users, and the fact that there were so many calls that morning,
I traced back one of the end user stations to a particular hub ( we had hubs
plugged into switches at the time ) and I was shocked to see the collision
light solid red. I was able to use the HP stack manager software to discover
that a particular port was just saturating the hub with traffic. Tracking
down that user, I learned that particular person was connected to a
particular internet based service ( some kind of research database ) and was
downloading and updating a complex database file using a particular
proprietary piece of software. The damn thing practically seized the entire
bandwidth of that hub, and so monopolized the traffic that other folks were
losing their connections to the Novell servers, I am guessing because of
lack of keepalives.
Once the problem was identified, I gave this particular user a dedicated
switch port, and life was good after that.
My point being that even though you have a very few users, all it takes is
one bandwidth piggy, and your shared collision domain network is toast.
Might want to convince the boss that investment in a Fluke meter or some
kind of management software is a good thing.
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of John
Brandis
Sent: Tuesday, April 17, 2001 5:09 PM
To: [EMAIL PROTECTED]
Subject: Network Collisions [7:1006]
G'day all where ever you may be.
I have been watching my network here in my office and I have noticed that
over
the last week, that the network is slowing down. Due to financial
constraints,
we are using 10/100 16 port hubs (2) {just thought I would point that out} I
have noticed that the collision LED's are on a fair bit these days. I
checked
to see if the errors where due to cable problems or broken ports on the hub,
but this was not the case. I made sure all the PC's were using the same
protocol and still I have an abnormal amount of collisions. I understand
that
I will have collisons but for a 11 user network that is centerd around a
WIN2k
Server/Exchange server I have about a 40% collision rate.
Does any one have any idea's (besides the obvious of buying a switch) on how
I
can troubleshoot this or fix the problem.......
Thanks gang
John Brandis
Network Engineer
GoWireless Communications
155 George Street Sydney
+61 2 9251 5000
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