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Managing Mission - Critical Domains and DNS

You're reading from Managing Mission - Critical Domains and DNS

Product type Book

Published in Jun 2018

Publisher Packt

ISBN-13 9781789135077

Pages 368 pages

Edition 1st Edition

Languages

Concepts

Author (1):

Mark E.Jeftovic

Table of Contents (17) Chapters

Preface

1. The Domain Name Ecosystem

2. Registries, Registrars, and Whois

3. Intellectual Property Issues

4. Communication Breakdowns

5. A Tale of Two Nameservers

6. DNS Queries in Action

7. Types and Uses of Common Resource Records

8. Quasi-Record Types

9. Common Nameserver Software

10. Debugging Without Tears – DNS Diagnostic Tools

11. DNS Operations and Use Cases

12. Nameserver Considerations

13. Securing Your Domains and DNS

14. DNS and DDoS Attacks

15. IPv6 Considerations

16. Other Books You May Enjoy

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When does DNS use TCP instead of UDP?

Most of the time, DNS happens over UDP. It's lightweight and faster than TCP. There have been trade-offs as a result of the design decision. It's easier to spoof UDP packets, so you have to worry about things like cache poisoning or DDoS attacks involving forged packet headers.

But nameservers still need to be available on TCP as well as UDP. The following will explain why.

Zone transfers happen over TCP

The AXFR and IXFR methods of transferring updated zone data from the master to its secondaries occur over TCP.

In some cases, when a slave queries the master to check whether an update is required, it may happen over TCP (for example, NSD nameservers do this).

...

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Authors (1)

Mark E.Jeftovic

Mark E. Jeftovic is the cofounder and CEO of easyDNS Technologies Inc, the managed DNS provider and domain name registrar. He was formerly a director to the Canadian Internet Registration Authority (CIRA) and is currently a director to the Internet Society Canada Chapter. Mark entered the internet space in the early '90s as a computer programmer and Unix sysadmin, working for the early dial-up ISPs in Toronto before cofounding a web development firm in 1995 that later morphed into easyDNS. A lifelong guitarist and avid bookworm, Mark lives in Toronto with wife Angela and daughter Emily.

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