What is going to happen on February 1, 2020?

Problems, officer?

  • Support for EDNS version negotiation on public DNS servers;
  • Support for RaNdOmIzAtIoN of capital and lowercase letters in DNS queries to increase entropy contained in the requests and responses;
  • DNS over TCP support on DNS servers (both authoritative and recursive);
  • Implementation of RFC 8020, which instructs recursive resolvers to stop quering a domain and all of its subdomains if they receive an NXDOMAIN-type response;
  • IPv6 support etc.

Over TCP

  1. Delivery of responses with sizes exceeding path MTU, without using generally unreliable IP fragmentation;
  2. DNSSEC support;
  3. Fighting DDoS attacks;
  4. Etc.
  • 90% of the issues are associated with the work of authoritative servers of 10 companies;
  • 68% of the issue is locked on the servers of a single company — the Chinese ISP Hichina;
  • Together with other Chinese providers — the AliDNS and Xinnet, this share rises to 72%;
  • Half of the names on the list also had issues with EDNS in November 2018, though resolved them successfully just about the time.

What’s next?

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DDoS Attacks Mitigation and Continuous Availability

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