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====== Networking - DNS - DNS Performance Tests ======

Determine which DNS server is the quickest to use.

If all you care about is speed, then the DNS with the lower number for the websites you care about is probably your best bet.

----

===== Required =====

You need to install bc and dig. For Ubuntu:

<code bash>
sudo apt-get install bc dnsutils
</code>

----

===== Install =====

<code bash>
git clone --depth=1 https://github.com/cleanbrowsing/dnsperftest/
</code>

or manually create the following file, make it executable and run it:

<file bash dnstest.sh>
#!/usr/bin/env bash

command -v bc > /dev/null || { echo "bc was not found. Please install bc."; exit 1; }
{ command -v drill > /dev/null && dig=drill; } || { command -v dig > /dev/null && dig=dig; } || { echo "dig was not found. Please install dnsutils."; exit 1; }



NAMESERVERS=`cat /etc/resolv.conf | grep ^nameserver | cut -d " " -f 2 | sed 's/\(.*\)/&#&/'`

PROVIDERS="
192.168.1.1#pfSense
192.168.1.2#Bind Server
1.1.1.1#cloudflare 
4.2.2.1#level3 
8.8.8.8#google 
9.9.9.9#quad9 
80.80.80.80#freenom 
208.67.222.123#opendns 
199.85.126.20#norton 
185.228.168.168#cleanbrowsing 
77.88.8.7#yandex 
176.103.130.132#adguard 
156.154.70.3#neustar 
8.26.56.26#comodo
"

# Domains to test. Duplicated domains are ok
DOMAINS2TEST="www.google.com amazon.com facebook.com www.youtube.com www.reddit.com  wikipedia.org twitter.com gmail.com www.google.com whatsapp.com"


totaldomains=0
printf "%-18s" ""
for d in $DOMAINS2TEST; do
    totaldomains=$((totaldomains + 1))
    printf "%-8s" "test$totaldomains"
done
printf "%-8s" "Average"
echo ""


for p in $NAMESERVERS $PROVIDERS; do
    pip=${p%%#*}
    pname=${p##*#}
    ftime=0

    printf "%-18s" "$pname"
    for d in $DOMAINS2TEST; do
        ttime=`$dig +tries=1 +time=2 +stats @$pip $d |grep "Query time:" | cut -d : -f 2- | cut -d " " -f 2`
        if [ -z "$ttime" ]; then
	        #let's have time out be 1s = 1000ms
	        ttime=1000
        elif [ "x$ttime" = "x0" ]; then
	        ttime=1
	    fi

        printf "%-8s" "$ttime ms"
        ftime=$((ftime + ttime))
    done
    avg=`bc -lq <<< "scale=2; $ftime/$totaldomains"`

    echo "  $avg"
done


exit 0;
</file>

----

===== Run =====

<code bash>
cd dnsperftest
bash ./dnstest.sh 
</code>

returns:

<code bash>
                  test1   test2   test3   test4   test5   test6   test7   test8   test9   test10  Average 
127.0.0.53        9 ms    9 ms    9 ms    14 ms   19 ms   20 ms   9 ms    14 ms   1 ms    9 ms      11.30
Peter             1 ms    1 ms    1 ms    1 ms    1 ms    1 ms    1 ms    1 ms    1 ms    1 ms      1.00
cloudflare        8 ms    10 ms   8 ms    8 ms    11 ms   9 ms    8 ms    9 ms    8 ms    8 ms      8.70
level3            13 ms   14 ms   14 ms   14 ms   14 ms   13 ms   14 ms   13 ms   13 ms   14 ms     13.60
google            7 ms    7 ms    19 ms   12 ms   18 ms   19 ms   7 ms    13 ms   7 ms    12 ms     12.10
quad9             20 ms   18 ms   23 ms   22 ms   14 ms   120 ms  15 ms   20 ms   16 ms   23 ms     29.10
freenom           25 ms   35 ms   20 ms   46 ms   42 ms   148 ms  25 ms   25 ms   22 ms   121 ms    50.90
opendns           8 ms    8 ms    8 ms    25 ms   8 ms    112 ms  8 ms    25 ms   13 ms   9 ms      22.40
norton            8 ms    8 ms    8 ms    8 ms    8 ms    8 ms    8 ms    8 ms    8 ms    8 ms      8.00
cleanbrowsing     19 ms   15 ms   14 ms   18 ms   19 ms   18 ms   14 ms   14 ms   14 ms   14 ms     15.90
yandex            47 ms   76 ms   47 ms   47 ms   47 ms   160 ms  47 ms   52 ms   47 ms   47 ms     61.70
adguard           19 ms   18 ms   18 ms   19 ms   14 ms   14 ms   14 ms   18 ms   14 ms   20 ms     16.80
neustar           20 ms   20 ms   22 ms   20 ms   21 ms   22 ms   24 ms   21 ms   22 ms   20 ms     21.20
comodo            14 ms   15 ms   13 ms   15 ms   13 ms   128 ms  14 ms   14 ms   15 ms   16 ms     25.70
</code>


<WRAP info>
**NOTE:**  To sort with the fastest first, add **| sort -k 22 -n** at the end of the command:

<code bash>
dnstest.sh | sort -k 22 -n
</code>


==== For Windows users using the Linux subsystem ====

If you receive an error **<nowiki>$'\r':</nowiki>** command not found, convert the file to a Linux-compatible line endings using:

<code bash>
tr -d '\15\32' < dnstest.sh > dnstest-2.sh
</code>

Then run bash ./dnstest-2.sh
</WRAP>

----

===== Use Docker to run the DNS performance test =====

==== Have a Dockerfile ====

Dockerfile contains the following:

<file bash Dockerfile>
FROM alpine:latest
RUN apk --no-cache add bash bc drill \
    && mkdir /app \
    && wget https://raw.githubusercontent.com/cleanbrowsing/dnsperftest/master/dnstest.sh -O /app/dnstest.sh \
    && chmod +x /app/dnstest.sh

ENTRYPOINT ["/app/dnstest.sh"]
</file>

----

==== Build the Docker image ====

<code bash>
docker build --tag dnstest .
</code>

returns:

<code bash>
Sending build context to Docker daemon  83.46kB
Step 1/3 : FROM alpine:latest
latest: Pulling from library/alpine
aad63a933944: Pull complete 
Digest: sha256:b276d875eeed9c7d3f1cfa7edb06b22ed22b14219a7d67c52c56612330348239
Status: Downloaded newer image for alpine:latest
 ---> a187dde48cd2
Step 2/3 : RUN apk --no-cache add bash bc drill     && mkdir /app     && wget https://raw.githubusercontent.com/cleanbrowsing/dnsperftest/master/dnstest.sh -O /app/dnstest.sh     && chmod +x /app/dnstest.sh
 ---> Running in a8c11400d24c
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/APKINDEX.tar.gz
(1/7) Installing ncurses-terminfo-base (6.1_p20200118-r3)
(2/7) Installing ncurses-libs (6.1_p20200118-r3)
(3/7) Installing readline (8.0.1-r0)
(4/7) Installing bash (5.0.11-r1)
Executing bash-5.0.11-r1.post-install
(5/7) Installing bc (1.07.1-r1)
(6/7) Installing ldns (1.7.1-r1)
(7/7) Installing drill (1.7.1-r1)
Executing busybox-1.31.1-r9.trigger
OK: 8 MiB in 21 packages
Connecting to raw.githubusercontent.com (151.101.64.133:443)
saving to '/app/dnstest.sh'
dnstest.sh           100% |********************************|  1582  0:00:00 ETA
'/app/dnstest.sh' saved
Removing intermediate container a8c11400d24c
 ---> f04a1f625386
Step 3/3 : ENTRYPOINT ["/app/dnstest.sh"]
 ---> Running in f23f9090e44f
Removing intermediate container f23f9090e44f
 ---> 2d50dc06d819
Successfully built 2d50dc06d819
Successfully tagged dnstest:latest
</code>

----

==== Run the Docker image ====


<code bash>
docker run dnstest
</code>


----

===== References =====

https://github.com/cleanbrowsing/dnsperftest

https://www.senki.org/network-operations-scaling/dns-latency-and-performance-test-tools/