"Dig the secrets of the DNS"-linux command five-minute series of 34 __linux

Turn from: http://roclinux.cn/?p=2449

This original article belongs to the "Linux Shed" blog.

The blog address is http://roclinux.cn.

The author of the article is ROC.

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"First meeting."

I believe that the use of Nslookup students must be more than the use of dig students, so it is necessary to spend some time to introduce you to the dig.

Dig, similar to the Nslookup function, is a DNS query tool.

Dig, in fact, is an abbreviation, that is, domain information groper.

Some professional DNS administrators in tracing DNS issues, are happy to use the dig command, is a fancy dig set flexible, clear output, powerful features.

"The simplest dig usage"

The simplest dig usage, of course, is to directly enter Dig press ENTER.

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$ dig; <<>> DiG 9.8.2rc1-redhat-9.8.2-0.10.rc1.el6_3.2 <<>> Version information of the Dig command;; Global options: +cmd; Got answer:;; ->> header<

From the above output, you must have observed that when using the dig command directly, without any arguments or options, dig queries the default DNS server. NS record for (root domain).

"Dig, add a point."

Just enter dig, this time we add a "." In the back, to see the difference between the results and just now:

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$ dig