I have no idea which solution Oink is implementing, but you need to remember that it's a lot harder to DDOS a site like Oink than it is to DDOS most other sites. It requires a lot more sources and synchronization. Oink was built to handle huge amounts of traffic, which makes it immune to most smaller scaled DOS attacks.
Hell, I bet most trackers would consider Oink's normal traffic as a massive DDOS attack..
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