1. Drop hacks aren't usally ddos attacks, but rather some exploit that makes the match crash.
2. You can not get the IP of the players since it all goes via Riots server. (ofc you can ask for their skype -> IP resolve etc... )
3. The IP of the match can be found in lastCmd.txt found in the LoL directory.
I have a botnet with 6K unix. HMU for DDoS service