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Google Public DNS

December 4th, 2009

I just read an article about Google publishing a Public DNS service. Google Public DNS is a free, global DNS resolution service. Google recommends using their Public DNS server as an alternative to your current DNS servers.

To try it out:

  • Configure your network settings to use the IP addresses 8.8.8.8 and 8.8.4.4 as your DNS server

More information about Google’s Public DNS can be found here.

dig @8.8.8.8 www.booches.nl

; <<>> DiG 9.3.2 <<>> @8.8.8.8 www.booches.nl
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 708
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.booches.nl.                        IN      A

;; ANSWER SECTION:
www.booches.nl.         900     IN      A       83.137.194.63

;; Query time: 97 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Dec 04 09:03:26 2009
;; MSG SIZE  rcvd: 48

I will be using Google’s DNS service for testing purposes, because I cannot imagine using them as primary DNS. There are a lot of questions, like:

  • Performance
  • Support

Maybe I will use them as third or fourth DNS forwarders after the DNS servers from my provider.

René Jorissen works as Solution Specialist for 4IP in the Netherlands. Network Infrastructures are the primary focus. René works with equipment of multiple vendors, like Cisco, HP Networking, Juniper Networks, RSA, PaloAlto Networks, Microsoft and many more. René is CCNA (Routing & Switching, Security), CCNP , Cisco ASA Specialist and CEFFS certified. You can follow René on Twitter and LinkedIn.
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3 Responses to “Google Public DNS”

  1. John Coke Says:

    What was the response time for your ISPs DNS servers? I know of people that use OpenDNS because their ISPs’ servers are quite slow by comparison.


  2. René Jorissen Says:

    I used ns_bench to compare Googles Public DNS servers to my ISPs DNS servers. Here is the result:

    Nameserver Response Time (ms)
    min/avg/max/stdev/retries

    8.8.8.8 21.00/24.00/30.00/3.52/0
    8.8.4.4 22.00/22.80/24.00/0.75/0
    194.109.6.66 17.00/20.00/27.00/3.79/0
    194.109.9.99 17.00/19.00/24.00/2.53/0

    So a slight advantage for my own provider


  3. Jonathan Says:

    how to redirect all dns request from internal to one ip and block all open public dns with asa ?


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