Network problem

Neal Richardson nsr at ptcnh.net
Thu Aug 28 20:27:35 EDT 2003


It is a  CNet dual speed hub the switch I believe is also cheap but I do 
not recall the manufacturer

Stephen Ingham wrote:

>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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