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04 April 2013

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World's biggest DDoS Attack Ever in the World


DDoS attack Do you know my friends that last week it has been seen probably the largest distributed denial-of-service (DDoS) attack ever on Internet. Around 300Gbps was thrown against Internet blacklist maintainer Spamhaus' website but the anti-spam organisation , CloudFlare was able to recover from this attack and get its core services back up and running etc.

The Spamhaus Project is an international organization based in both London and Geneva, founded in 1998 by Steve Linford to track email spammers and spam-related activity. The name spamhaus, a pseudo-German expression was coined by Linford for an Internet service provider, or other firm, which spams or knowingly provides service to spammers.

“In the Spamhaus case, the attacker was sending requests for the DNS zone file for ripe.net to open DNS resolvers. The attacker spoofed the CloudFlare IPs we'd issued for Spamhaus as the source in their DNS requests. The open resolvers responded with DNS zone file, generating collectively approximately 75Gbps of attack traffic. The requests were likely approximately 36 bytes long (e.g. dig ANY ripe.net @X.X.X.X +edns=0 +bufsize=4096, where X.X.X.X is replaced with the IP address of an open DNS resolver) and the response was approximately 3,000 bytes, translating to a 100x amplification factor."

Read also- How to Flood a Website with Denial of Service Attack

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