I've two routers dual-homed with two ISP.
I'm interested in a tool (OPEN-SOURCE) for monitoring and accounting data passing through the routers and going to ISP. Which traffic goes through ISP 1 and which traffic goes through ISP 2?
That is I'm interested in tuning the traffic with BGP attributes (weight, preference and so on) in order to do load balancing between two ISP.
have a look at this page
it is a list of freeware SW that can collect netflow data from Cisco routers
Hope to help