Distributed Denial of Service attacks

Links

Whois Lookup
Unexpected DDOS: Blocking China with ipset and iptables
IP ranges of all countries (downloadable)
Block Access to Your Web Server with a Linux APF iptables Firewall Blocklist
Iptables Blacklist Script
The Beginner’s Guide to iptables, the Linux Firewall
World IP address space, IP addresses
How to determine what traffic is being dropped / blocked base on iptables log
Debian Iptables
Endian's startup scripts with inithooks
Is there a way to find which iptables rule was responsible for dropping a packet?
Do external sites see MAC address of router?