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Google Public DNS

René Jorissen on December 4, 2009 3 Comments • Tags: #dns #google #public

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 and as your DNS server

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

dig @ www.booches.nl

; <<>> DiG 9.3.2 <<>> @ 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

;www.booches.nl.                        IN      A

www.booches.nl.         900     IN      A

;; Query time: 97 msec
;; 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.

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René Jorissen

Co-owner and Solution Specialist at 4IP Solutions
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, Aruba Networks, FortiNet, HP Networking, Juniper Networks, RSA SecurID, AeroHive, Microsoft and many more. René is Aruba Certified Edge Expert (ACEX #26), Aruba Certified Mobility Expert (ACMX #438), Aruba Certified ClearPass Expert (ACCX #725), Aruba Certified Design Expert (ACDX #760), CCNP R&S, FCNSP and Certified Ethical Hacker (CEF) certified. You can follow René on Twitter and LinkedIn.

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  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. 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 21.00/24.00/30.00/3.52/0 22.00/22.80/24.00/0.75/0 17.00/20.00/27.00/3.79/0 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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