On 4 Aug 2001, mark wrote:
> Ive disabled all my gateways (as they are not being used) and iam still
> getting collisions on the network..
> Anyone else got any ideas at all please.
>
> as 1 minute iam told to expect it with the hardware iam using and the
> next iam not to expect it
>
> just makes me kinda unsure, as iave just started learning about
> networking and stuff and really need to know if these sort of things a
> re common or if i havn't set things up correctly
>
> Mark
>
Mark,
When ever you are using half-duplex, and hubs, you are going to
get some collisions. Collisions are when two nics on the network try
and talk at the same time. When you have computers connected to a hub,
any trafic that comes in one port is sent out all the ports. A
collision happens when one NIC starts sending out a messages, and before
this gets to the other NICs in the system, another NIC starts sending.
The more computers on the network, and the more trafic on the network,
the more collisions you get. Hubs can normaly only have one packet
travling through them at a time.
When you are using switches instead of hubs, you do not get
collisions because the switch takes care of it. They do this in two
ways. First of all, a switch will normaly only send packets out a port
to the computer(s) connected to that port. (You can have a hub
connected to a port on a switch, and get more then one computer hooked
up that way.) They also usualy are operating in the full duplex mode,
so they can send packets to a NIC at the same time the NIC is sending
packets to it. The switch has internel buffers and can have more then
one packet traveling through it at a time.
So, with a network connected up to a hug, some collisions are
normal. It is when they get to be more then a few persent of the total
trafic that you are having problems.
Mikkel
--
Do not meddle in the affairs of dragons,
for you are crunchy and taste good with ketchup.
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