Spamhous DDoS mechanism: How did they spoof thousands of IP addresses?

Regarding the explanation in this recent ComputerWorld.com article: "Spamhaus attacks expose huge open DNS server dangers"

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In that article, Matthew Prince, CEO of CloudFlare, was describing the attack as: "to generate DDoS traffic, the attackers behind the Spamhaus attack sent queries (with a spoofed source address) to tens of thousands of open DNS resolvers"

My question, which only need to be answered generically (i.e., I'm not planning on spoofing my IP address - but I don't understand HOW it can be spoofed).

Q: How did they spoof tens of thousands of IP addresses on the net?

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Posted 5 years ago by Francis C. in Wireless Networking

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