RE: Network interface testing utlity


Your monitor will indirectly monitor these errors if
it measures throughput which will decrease as the errors increase.
I always thought that the fields "Error on Receiving/Transmission", for example in the package ethstatus, is for telling if there are any errors detected in the link layer? Isn't that the case? If not, then what does those error tell you about?
 

Kushal Koolwal

I do blog at http://blogs.koolwal.net/







----------------------------------------
From: owens@xxxxxxxxxx
To: kushalkoolwal@xxxxxxxxxxx; owens@xxxxxxxxxx; debian-user@xxxxxxxxxxxxxxxx
Subject: RE: Network interface testing utlity
Date: Sun, 4 Oct 2009 07:32:53 -0700




---- Original Message ----
From: kushalkoolwal@xxxxxxxxxxx
To: owens@xxxxxxxxxx, debian-user@xxxxxxxxxxxxxxxx
Subject: RE: Network interface testing utlity
Date: Sat, 3 Oct 2009 23:37:52 -0700


OK then. The next question is how and what you intend to test. Are
you trying only to test a link (the media between your box and the
next box) or end-to end (where the two boxes are separated by many
links and many routers)?
Probably a block diagram of your proposed test setup would help.
BTW
what media types?

The idea is to test between two boxes (connected directly with a
standard CAT5 cable) to eliminate/minimize any other network
interference caused by routers, switches, hubs, etc.

On one box I will have my Gigabit Ethernet card (connected with
different media types) that I want to test and on the other end of
the box, I am going to have a standard known reference Gigabit
Ethernet.

The media types are:
a) Standard CAT5
b) Custom twisted pair

Kushal Koolwal

I do blog at http://blogs.koolwal.net/



OK then, here's my opintion
All (?) the tools you mention including Wireshark which is the one I
use will provide network statistics. Since they are software,
however, they reside above (in the protocol sense) the link (e.g.
Ethernet) which is where the majority of the errors are likely to
occur (if a check sum error occurs your Ethernet card will merely
discard it and wait for a retransmission so it will never be seen by
your analyzer). Your monitor will indirectly monitor these errors if
it measures throughput which will decrease as the errors increase. I
would surmise that by installing and using one of the tools you will
gain lots of insight and knowledge but not enough to definitively
choose between one network card and another.
Larry






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