Monitor Traffic By VIP

["AJ Lemke" <aj.lemke@xxxxxxxxxxxxxxxx>]

Hello All,
 
I am running a 2 node lvs-cluster and was wonder if the list could recommend
a traffic monitoring program.
My LVS is the frontend for a reverse-proxy cache and I would like to know
the traffic that each VIP is handling.
I need to know the data rates on a per ip basis.  I use mrtg at the switch
level but I need to have more granularity, hence the need for per IP basis. 
 
Any advice you have would be appreciated.
 
AJ