Hello, all.
I have operated some dns servers and I'm curious what should I do if
ddos attck to my dns servers.
So do you know how to defense against dns dddos attack like root server?
Surely, various ddos attack may be occurred.
My idea is..
-. filtering 53/udp traffic that the byte is over 512 byte
-. rate-limit against 53/udp queries
(but useless if the attack spoof the source ip)
-. deny recursion
-. anycast?
Is ther any comments or proposal?
Thanks in advance.
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