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DNS servers are critical to the Internet as they translate alphanumeric-based Web addresses like "www.google.com" into the numeric IP addresses that computers can understand.
The Spamhaus attacks reportedly utilized more than 30,000 unique DNS resolvers. There are efforts, such as the Open DNS Resolver Project, to convince DNS administrators to implement source address validation, among other actions, to eliminate open DNS resolvers as a Net-wide weakness.
There are also calls for IT departments and individual PC owners to make a greater effort to scan their computers for signs of malware that could be hijacking their machines into becoming part of a botnet. Additionally, the Electronic Frontier Foundation and others have offered tips to small businesses on how to cope with DDoS attacks, if their sites become one of the direct or indirect targets.