UNIX® System Administration Handbook by Nemeth Evi & Snyder Garth & Seebass Scott & Hein Trent

Author:Nemeth, Evi & Snyder, Garth & Seebass, Scott & Hein, Trent [Nemeth, Evi]
Language: eng
Format: mobi, epub

Setting up the root hints

Another form of zone statement points named toward a file from which it can prime (preload) its cache with the names and addresses of the root name servers:

zone "." {

type hint;

file "path";

};

The “hints” are a set of DNS records that list servers for the root domain (“.”). They’re needed to give named a place to start searching for information about other sites’ domains. Without them, named would only know about the domains it actually serves and their subdomains.

The hints file is often called root.cache; it contains the response you would get if you queried a root server for the name server records in the domain “.”. We discuss how to set up a proper hints file starting on page 479.

BIND 9 has root server hints compiled into its code, so no configuration of the root zone is really needed. If you provide a hints file, however, BIND 9 will use it. We recommend that you do supply explicit hints; politics have entered the DNS arena, making root name servers and their IP addresses more volatile.

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