[lug] OT Netwerking Layers 101

[Warren Sanders]

I'm testing out NTOP; a network traffic probe that shows the network usage 
(ntop.org) on our lan.

Our main panel is an HP ProCurve switch 4000M and is configured to allow my 
connection to monitor the network.

Was connected with a 5 port Linksys switch and found I was getting info from 
only what was going through this switch.  I then replaced it with an old 4 
port 10 base Netgear hub and I could then see all the network traffic.

Now I replaced the 5 port Linksys switch with a 5 port Linksys 100 base hub 
(EFAH05W) and I'm back to only seeing my branch of the network.  Just for 
kicks I linked off this with another Linksys 10 base hub and moved only my 
connection to this and can see all the network again!

So I'm wondering if the Linksys 100 hub is doing something to the network 
layers that you normally see in a switch (private lines)?  I'm confused!  I 
don't want to have to us a 10 base hub whenever I need to monitor; why can't 
the 100's do it?

Thanks for any insight,
-- 
Warren Sanders
http://MontanaLinux.Org