What you're describing would suggest a problem with late collisions
which fits your supposition of flaky hardware since that's the
exclusive cause of late collisons. The typical term for packets where
late collisons have occurred is, I think, stub packets or snub or
something like that. Basically, they are short packets.
Any good sniffer should be able to discover them and report them, and
suggest you look at ethereal -- it may or may not. The URL is:
http://ethereal.zing.org.
If I understand your network scenario correctly, the two pieces of your
network are connected by hubs, so any late collisions will be
detectable anyplace on the network, including your desk, and you can
run a sniffer right from there. If you have bridging or switching (or
a router) anywhere in between, than that splits the collision domains,
and the only thing you'll notice from your desk is slowness. One other
thing, if you're using switches and presuming they're not $1.98 K-Mart
specials, thety are probably collecting bunches of useful performance
statistics, including counts of late collisions. Reset the counters so
you have base and then just watch them.
-- Rob
--On 09/20/00 11:11:09 AM -0400 "Barry L. Kline"
<[EMAIL PROTECTED]> wrote:
> Does anyone know of a Linux-based piece of software for testing a
> TCP/IP network? I have a segment of my network that's in another
> building which is connected by glass. Machines over there are getting
> exquisitely slow response times and my supposition is that TCP/IP
> retries are occuring due to some flakey equipment. Ping works fine to
> anything over there, yet any transmissions of sizeable data take
> forever. I have two transceivers and two hubs that could be the
> problem and I don't have spares (currently.)
>
> I have hardware-based testing equipment for testing 10-BaseT but
> nothing that will cross the different media types.
>
> If there is a piece of software that would load up a network and give
> me some idea of the current stats I could start isolating each piece,
> using my laptop and another computer. A google search hasn't turned
> up anything yet I'm sure that one must exist already.
>
> Any suggestions?
>
> TIA,
>
> Barry
>
>
>
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_ _ _ _ _ _ _ _ _ _
/\_\_\_\_\ /\_\ /\_\_\_\_\_\
/\/_/_/_/_/ /\/_/ \/_/_/_/_/_/ QUIDQUID LATINE DICTUM SIT,
/\/_/__\/_/ __ /\/_/ /\/_/ PROFUNDUM VIDITUR
/\/_/_/_/_/ /\_\ /\/_/ /\/_/
/\/_/ \/_/ /\/_/_/\/_/ /\/_/ (Whatever is said in Latin
\/_/ \/_/ \/_/_/_/_/ \/_/ appears profound)
Rob Tanner
McMinnville, Oregon
[EMAIL PROTECTED]
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