Network problem

[Stephen Ingham]

Question: What kind of Hub?

A good repeater hub will automatically turn off a port when 32 consecutive
collisions are detected. Maybe your hub doesn't have this feature or the
problem was something other than 32 consecutive collisions.

A switch or bridge will also stop all collisions and other errors from
propagating over the entire network.

Warning: Many cheap multi-port 10/100 "switches" are not true switches but
are really two repeaters plus a 2 port switch. A 10Mbit and a 100Mbit
repeater connected to all ports. The hardware will detect the connection
speed and connect it to the appropriate repeater. The switch is used to
switch between the 10Mbit and 100Mbit repeaters. But if all the devices are
connected at the same speed, then you do not have the network protection of
a true multi-port switch.



-----Original Message-----
From: gnhlug-discuss-admin at mail.gnhlug.org
[mailto:gnhlug-discuss-admin at mail.gnhlug.org] On Behalf Of Neal Richardson
Sent: Thursday, August 28, 2003 6:35 PM
To: discuss at gnhlug.org
Subject: OT: Network problem

  I needed to install a small hub in part of the build that was not on 
the network. When I connected the hub to the switch from the crossover 
port the whole network came crashing to the ground and the server locked 
up hard. Upon further investigation it turns out that the RJ45 jacks 
were wired complete wrong ( The old admin made the cable).
 
 My question is this:  Is this normal behavior to have the whole network 
go down due to a mis wired cable. I can understand the hub not working 
but to cause the whole thing to crash seams bizarre to me

Thanks
Neal

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