Good Network monitoring programs?

[Gannon]

I'm looking for software to detect, map and keep track of ip's spamming my ISP's local subnet, what are some good tools for the job that give simple and easy to read network maps / logs, diagrams, etc?

Moving to Networking-Oakenfold PC Gaming and Security Moderator

 

[JackMDS]

And where are you going to install such a tool?

Are you the ISP?