[CentOS] monitor invidiual client (PC) network traffic to server?

mcclnx mcc wrote:
> We have DELL servers with CENTOS 3 and 4 installed. Application is client/server type.  
>
> Does there has way monitor invidual client (PC) network traffic to server?
>   


nmon can do this, but its fairly involved to setup, and the collection
daemon can use quite a lot of CPU (to do this, you need to sniff all
traffic, categorize the packets by whatever criteria you're interested
in monitoring, and count them)