Hi

I have 2 computers connected to a 10 mb/sec and an adsl 750kb/sec also connected to the same hub.

now the nic cards on the pc's support 100 mb 'couse the hub is 10 the nic are set to 10 I want to check if the hub speed isnt a bottle neck.

how can I know that and also calculate how much real data is passing throw the nics and how is the bottle neck if any...

thanks

same here, can't really tell what speed is linux into

Everything's a bottle neck... Depends how fast you want your LAN to go...
Your machines will be able to easily handle all the traffic going to and from the hub... even running at 10% (100mb down to 10mb).

The Hub on the other hand will be the bottle neck between your two pc's... as the maximum traffic to go through there will be less than 10mb/s (why? Because of collisions. You should use a switch instead.)

THe Hub will NOT be a bottleneck to the internet since you are telling us that your connection is less than 1mb/s.

Soo...
downloading from the net will be as fast as possible but transferring files between the two pc's will be less than optimal.

There are all kinds of monitoring products out there... check 'em out.