Network traffic/bandwidth monitor that tracks GLOBAL network traffic

Is there a good network traffic/broadband monitor that actually keeps track of ALL (really ALL) traffic in a network?
I have used quite a few (eg, Ethereal, ntop, network probe) but all of them kinda keep track of only traffic that is coming in and out of the PC they are run from.

I need one that really tracks every single transaction that goes on in the network, including PCs talking to PCs, PCs talking to servers, servers talking to PCs, PCs talking to printers, etc.

Would help a great deal if they are FREE too!

Anyone know of any good ones?

 

Hi.

You may find something here...

http://www.freewarehome.com/Internet/Networking/Network_Monitoring_t.html

 

It will only work on the port it is connected to if you are using a switch, you either need all PC's to be connected to a hub or use a switch that can forward all traffic to a monitoring port (such as a HP 2524)
Ethereal works fine with that type of switch...
Cheers,
10forcash