Any software to log outbound IP for dos?

I’m interesting in finding freeware software that will allow me to check which IP address was sending tremendous amounts of packets. Then I could block the IP from the network. Particularly, I want it to log the information so I can analyze it later.

[editline]16th June 2013[/editline]

I’m asking if someone has a network analyzer they could recommend for server hosting.

Ask your provider, they should keep logs.