Open DNS Resolvers - Coming to an IP Address Near You!
Three vectors were exploited in the recent DDoS attack against Spamhaus: 1) Amplification of DNS queries through the use of DNSSEC signed data 2) Spoofed source addresses due to lack of ingress filtering (BCP-38) on originating networks 3) Utilisation of multiple open DNS resolvers While 1) is unavoidable simply due to the additional data that DNSSEC produces, and 2) “should” be practised as part
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