DNS AND BIND BY PAUL ALBITZ AND CRICKET LIU PDF

Covers BIND 9. BIND 9. In his current role as the Vice President of Architecture at Infoblox , Cricket helps guide development of the product strategy and service offerings, and serves as a liaison between Infoblox and the technical community. He previously worked for Hewlett-Packard for nearly ten years, where he ran hp.

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You see, while you, as a human being, prefer to remember the names of computers, computers like to address each other by number. On an internet, that number is 32 bits long, or between 0 and 4 billion or so. Pick 10 phone numbers out of the phone book at random and then try to remember them.

Not easy? Now flip to the front of the phone book and attach random area codes to the phone numbers. This is part of the reason we need the Domain Name System.

DNS handles mapping between hostnames, which we humans find convenient, and internet addresses, which computers deal with. In fact, DNS is the standard mechanism on the Internet for advertising and accessing all kinds of information about hosts, not just addresses. Another important feature of DNS is that it makes host information available all over the Internet. Keeping information about hosts in a formatted file on a single computer only helps users on that computer.

DNS provides a means of retrieving information remotely from anywhere on the network. More than that, DNS lets you distribute the management of host information among many sites and organizations.

You simply make sure your section, called a zone, is up to date on your nameservers. The Domain Name System gives nameservers the intelligence to navigate through the database and find data in any zone. Of course, DNS does have a few problems.

Most administrators on the Internet make do with the documentation their vendors see fit to provide and with whatever they can glean from following the Internet mailing lists and Usenet newsgroups on the subject. New zone administrators suffer through the same mistakes made by countless others. Our aim with this book is to help remedy this situation.

We realize that not all of you have the time or the desire to become DNS experts. Most of you, after all, have plenty to do besides managing your zones and nameservers: system administration, network engineering, or software development.

It takes an awfully big institution to devote a whole person to DNS. Read as much as you need to know now, and come back later if you need to learn more. The first two chapters give you a good theoretical overview and enough practical information to get by, and later chapters fill in the nitty-gritty details.

We provide a roadmap up front to suggest a path through the book appropriate for your job or interest. One of our zones, incidentally, was once one of the largest on the Internet, but that was a long time ago. Versions The fifth edition of this book deals with the new 9. While 9. We also occasionally mention other versions of BIND because many vendors continue to ship code based on this older software as part of their Unix products.

Whenever a feature is available only in the 8. We use nslookup, a nameserver utility program, very frequently in our examples. The version we use is the one shipped with the 9. Older versions of nslookup provide much, but not quite all, of the functionality in the 9. Chapters 1 and 2 discuss Domain Name System theory. Chapters 3 through 6 help you decide whether or not to set up your own zones, then describe how to go about it, should you choose to.

The middle of the book, Chapters 7 through 11 , describe how to maintain your zones, configure hosts to use your nameservers, plan for the growth of your zones, create subdomains, and secure your nameservers. Chapters 12 through 16 deal with troubleshooting tools, common problems, and the lost art of programming with the resolver library routines.

Chapter 16 puts it all together in an end-to-end architecture.

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It goes without saying that this is the book to help you set up and administer DNS servers. This fourth edition brings it up to date and it now covers BIND 9. The book as a whole has been updated with examples changed to cover the more recent versions of BIND. Incremental zone transfer, and forward zones which support conditional forwarding are introduced, as well as support for IPv6 forward and reverse mapping using the new A6 and DNAME records. The security section now covers TSIG or transaction signatures which is a new mechanism for authenticating transactions. There is an expanded section on securing name servers and expanded coverage of dealing with firewalls.

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