Why don't DNS root servers answer?

Posted by JustTrying on Server Fault See other posts from Server Fault or by JustTrying
Published on 2012-11-19T10:14:13Z Indexed on 2012/11/19 11:11 UTC
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dns

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dig

If I try to query a root server with dig, I never receive an answer.

For example the output for dig @b.root-servers.net www.ubuntu.com is

; <<>> DiG 9.8.1-P1 <<>> @b.root-servers.net www.ubuntu.com

; (1 server found)

;; global options: +cmd

;; connection timed out; no servers could be reached

But if I query other servers (the one of my ISP, or 8.8.8.8), they answer correctly. Why?

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