DNS Performance Tester - Based on DNSperf

dns.sh

#!/bin/bash

# Ubuntu / Debian dnsperf is required to run this script, follow the installation steps below
## sudo apt-get update && sudo apt-get install -y build-essential libbind-dev libkrb5-dev libssl-dev libcap-dev libxml2-dev wget curl
## wget https://www.dns-oarc.net/files/dnsperf/dnsperf-2.3.3.tar.gz
## tar -xvzf dnsperf-2.3.3.tar.gz
## cd dnsperf-2.3.3
## ./configure
## make
## sudo make install
## dnsperf -h

# macOS
## brew install dnsperf


# List of DNS servers to test
dns_servers=(
  "8.8.8.8"             # Google DNS
  "8.8.4.4"             # Google DNS
  "1.1.1.1"             # Cloudflare DNS
  "1.0.0.1"             # Cloudflare DNS
  "208.67.222.222"      # OpenDNS
  "208.67.220.220"      # OpenDNS
  "9.9.9.9"             # Quad9 DNS
  "149.112.112.112"     # Quad9 DNS
  "8.26.56.26"          # Comodo Secure DNS
  "8.20.247.20"         # Comodo Secure DNS
  "185.228.168.168"     # CleanBrowsing (Family Filter)
  "185.228.169.168"     # CleanBrowsing (Family Filter)
  "156.154.70.3"        # Neustar UltraDNS (Family Protection)
  "156.154.71.3"        # Neustar UltraDNS (Family Protection)
  "77.88.8.8"           # Yandex DNS
  "77.88.8.1"           # Yandex DNS
  "94.140.14.14"        # AdGuard DNS
  "94.140.15.15"        # AdGuard DNS
  "64.6.64.6"           # Verisign DNS
  "64.6.65.6"           # Verisign DNS
  "208.76.50.50"        # SmartViper DNS
  "208.76.51.51"        # SmartViper DNS
  "84.200.69.80"        # DNS.WATCH
  "84.200.70.40"        # DNS.WATCH
  "4.2.2.1"             # Level3 DNS
  "4.2.2.2"             # Level3 DNS
  "216.146.35.35"       # Dyn DNS
  "216.146.36.36"       # Dyn DNS
)

# Path to your DNS query file
query_file="queries.txt"

# Output file for logging results
output_file="dns_performance_log.txt"

# Initialize variables for tracking the best-performing DNS servers
best_qps=0
best_qps_server=""
best_latency=1000  # Start with a very high latency
best_latency_server=""
lowest_error_rate=1000  # Start with a very high error rate
best_error_rate_server=""

# Initialize the log file
echo "DNS Performance Test Results" > $output_file
echo "==============================" >> $output_file

# Loop through each DNS server and test
for server in "${dns_servers[@]}"
do
  echo "Testing DNS server: $server"
  
  # Capture the performance output for each DNS server
  result=$(dnsperf -s $server -d $query_file 2>&1)
  
  # Extract relevant performance metrics from the output using grep/awk
  qps=$(echo "$result" | grep "Queries per second" | awk '{print $4}')
  avg_latency=$(echo "$result" | grep "Average Latency" | awk '{print $4}')
  errors=$(echo "$result" | grep "Queries lost" | awk '{print $4}')

  # Remove percentage sign from errors and convert it to a numeric value
  errors=$(echo "$errors" | sed 's/%//')

  # Check if values were extracted successfully, fallback to N/A if not
  qps=${qps:-"N/A"}
  avg_latency=${avg_latency:-"N/A"}
  errors=${errors:-"N/A"}
  
  # Log the results into the output file
  echo "DNS Server: $server" >> $output_file
  echo "Queries per second: $qps" >> $output_file
  echo "Average Latency (s): $avg_latency" >> $output_file
  echo "Error Rate: $errors" >> $output_file
  echo "------------------------------" >> $output_file
  
  # Check if QPS is the highest
  if [[ "$qps" != "N/A" && $(echo "$qps > $best_qps" | bc) -eq 1 ]]; then
    best_qps=$qps
    best_qps_server=$server
  fi

  # Check if latency is the lowest
  if [[ "$avg_latency" != "N/A" && $(echo "$avg_latency < $best_latency" | bc) -eq 1 ]]; then
    best_latency=$avg_latency
    best_latency_server=$server
  fi

  # Check if error rate is the lowest
  if [[ "$errors" != "N/A" && $(echo "$errors < $lowest_error_rate" | bc) -eq 1 ]]; then
    lowest_error_rate=$errors
    best_error_rate_server=$server
  fi
done

# Display the log file contents
cat $output_file

# Display the summary of the best-performing DNS servers
echo ""
echo "Best Performing DNS Servers Summary"
echo "==================================="
echo "Highest Queries per Second: $best_qps (DNS Server: $best_qps_server)"
echo "Lowest Average Latency: $best_latency s (DNS Server: $best_latency_server)"
echo "Lowest Error Rate: $lowest_error_rate (DNS Server: $best_error_rate_server)"