Application software to monitor network traffic

[Sui Seto]

Hi everyone, I am looking for a software that will monitor the network
traffic on our LAN/WAN . Sometimes I find the network is very sluggish and
at other times, it is normal, I want to pin down the problem. I also
expect the software to be able to identify which workstation is
transferring big files, such a ppt file etc. Thanks for your info.


Sui Seto 

http://www.sunbelt-software.com/ntsysadmin_list_charter.htm