A Domain Name Server (DNS) Amplification attack is a popular form of Distributed Denial of Service (DDoS), in which attackers use publically accessible open DNS servers to flood a target system with DNS response traffic. The primary technique consists of an attacker sending a DNS name lookup request to an open DNS server with the source address spoofed to be the target’s address.

Jun 18, 2020 Use OpenDNS Open the Control Panel.. Click Network and Internet.. Click Network and Sharing Center.. On the left pane, click Change adapter settings.. Right-click the network interface connected to the internet, then click Properties.. Choose Internet Protocol Version 4 (TCP/IPv4).. Click Properties.. DNS servers in United States - Public DNS Server List 101 rows Public DNS Server List 16 rows

If you are going to use this IP list as a blocklist / blacklist at a firewall, its size can be important for the performance of the firewall. Keep in mind that the performance of Linux netfilter / iptables firewalls that use ipsets (like FireHOL does), is not affected by the size of an ipset. Any number of entries can be added and the firewall will just do one lookup for every packet checked

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DNS Amplification Attacks | CISA

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