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