a function to find the fastest free DNS server

timeDNS() { parallel -j0 --tag dig @{} "$*" ::: 208.67.222.222 208.67.220.220 198.153.192.1 198.153.194.1 156.154.70.1 156.154.71.1 8.8.8.8 8.8.4.4 | grep Query | sort -nk5; }

Uses GNU Parallel.

Sample Output

208.67.222.222  ;; Query time: 18 msec
208.67.220.220  ;; Query time: 18 msec
198.153.194.1   ;; Query time: 22 msec
8.8.8.8 ;; Query time: 14 msec
8.8.4.4 ;; Query time: 18 msec
156.154.70.1    ;; Query time: 27 msec
198.153.192.1   ;; Query time: 42 msec
156.154.71.1    ;; Query time: 33 msec

By: unixmonkey74668

2015-04-26 08:22:32

dig grep sort function dig parallel

2 Alternatives + Submit Alt

a function to find the fastest free DNS server

Evoke from the command like as: timeDNS commandlinefu.com . This isn't too terribly practical, but it is a good code example of using subshells to run the queries in parallel and the use of an "anonymous function" (a/k/a "inline group") to group i/o. . I'm assuming you have already defined your local DNS cache as ${local_DNS}, (here, it's 192.168.0.1). . You do need to install `moreutils` to get `sponge`. . If you're willing to wait, a slower version w/o sponge, (and w/o sorting), is this: . DNS () { for x in "192.168.0.1" "208.67.222.222" "208.67.220.220" "198.153.192.1" "198.153.194.1" "156.154.70.1" "156.154.71.1" "8.8.8.8" "8.8.4.4"; do (echo -n "$x "; dig @"$x" "$*"|grep Query) ; done ; } Show Sample Output
This is sample output - yours may be different.
```
$ timeDNS commandlinefu.com
192.168.0.1 ;; Query time: 2 msec
208.67.222.222 ;; Query time: 13 msec
198.153.192.1 ;; Query time: 17 msec
208.67.220.220 ;; Query time: 17 msec
156.154.71.1 ;; Query time: 18 msec
8.8.8.8 ;; Query time: 20 msec
156.154.70.1 ;; Query time: 22 msec
8.8.4.4 ;; Query time: 22 msec
198.153.194.1 ;; Query time: 27 msec
```
1

timeDNS () { { for x in "${local_DNS}" "208.67.222.222" "208.67.220.220" "198.153.192.1" "198.153.194.1" "156.154.70.1" "156.154.71.1" "8.8.8.8" "8.8.4.4"; do ({ echo -n "$x "; dig @"$x" "$*"|grep Query ; }|sponge &) done ; } | sort -n -k5 ; }

unixmonkey365 · 2011-08-18 01:11:53 6
a function to find the fastest DNS server

http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list. Show Sample Output
This is sample output - yours may be different.
```
12.876  200.187.95.4
```
1

curl -s http://public-dns.info/nameserver/br.csv| cut -d, -f1 | xargs -i timeout 1 ping -c1 -w 1 {} | grep time | sed -u "s/.* from $[^:]*$.*time=$[^ ]*$.*/\2\t\1/g" | sort -n | head -n1

glaudiston · 2017-02-02 12:00:38 20

What Others Think

Had to use "--gnu" option to parallel.

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What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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