dns_test.sh

#!/bin/bash

# A list of top domains to ensure we aren't just hitting a single cached record
DOMAINS=(
    "google.com" "youtube.com" "facebook.com" "baidu.com" "yahoo.com" "amazon.com" "wikipedia.org" "google.co.in" "twitter.com" "qq.com"
    "live.com" "taobao.com" "bing.com" "instagram.com" "weibo.com" "vk.com" "yandex.ru" "google.ru" "ebay.com" "reddit.com"
    "google.co.uk" "google.com.br" "mail.ru" "t.co" "pinterest.com" "amazon.co.jp" "google.fr" "netflix.com" "tmall.com" "360.cn"
    "google.it" "microsoft.com" "google.es" "paypal.com" "sohu.com" "wordpress.com" "tumblr.com" "blogspot.com" "imgur.com" "xvideos.com"
    "apple.com" "stackoverflow.com" "github.com" "imdb.com" "google.ca" "google.co.kr" "ok.ru" "pornhub.com" "whatsapp.com" "office.com"
    "rakuten.co.jp" "google.co.id" "diply.com" "amazon.de" "craigslist.org" "google.com.tr" "t.me" "uol.com.br" "google.pl" "nicovideo.jp"
    "outbrain.com" "google.com.au" "fandom.com" "bitly.com" "google.com.hk" "booking.com" "quora.com" "chase.com" "adobe.com" "163.com"
    "bbc.co.uk" "nytimes.com" "foxnews.com" "espn.com" "cnn.com" "dailymail.co.uk" "forbes.com" "theguardian.com" "huffpost.com" "wsj.com"
    "ebay.co.uk" "aliexpress.com" "walmart.com" "etsy.com" "target.com" "bestbuy.com" "homedepot.com" "ikea.com" "macys.com" "costco.com"
    "dropbox.com" "vimeo.com" "soundcloud.com" "twitch.tv" "dailymotion.com" "spotify.com" "flickr.com" "deviantart.com" "disney.com" "hulu.com"
    "discord.com" "zoom.us" "slack.com" "canva.com" "medium.com" "notion.so" "trello.com" "asana.com" "monday.com" "zendesk.com"
    "cloudflare.com" "digitalocean.com" "heroku.com" "aws.amazon.com" "azure.com" "godaddy.com" "namecheap.com" "bluehost.com" "siteground.com" "wix.com"
    "espn.go.com" "bleacherreport.com" "nfl.com" "nba.com" "mlb.com" "nhl.com" "goal.com" "skysports.com" "eurosport.com" "sportingnews.com"
    "bloomberg.com" "reuters.com" "cnbc.com" "ft.com" "economist.com" "businessinsider.com" "hbr.org" "fastcompany.com" "inc.com" "entrepreneur.com"
    "wired.com" "theverge.com" "techcrunch.com" "engadget.com" "gizmodo.com" "arstechnica.com" "cnet.com" "zdnet.com" "mashable.com" "pcgamer.com"
    "nationalgeographic.com" "history.com" "discovery.com" "smithsonianmag.com" "scientificamerican.com" "nature.com" "nasa.gov" "ted.com" "khanacademy.org" "coursera.org"
    "nike.com" "adidas.com" "zara.com" "hm.com" "uniqlo.com" " Sephora.com" "ulta.com" "nordstrom.com" "gap.com" "oldnavy.com"
    "tripadvisor.com" "expedia.com" "kayak.com" "airbnb.com" "hotels.com" "skyscanner.net" "lonelyplanet.com" "yelp.com" "zillow.com" "realtor.com"
    "allrecipes.com" "foodnetwork.com" "epicurious.com" "seriouseats.com" "bonappetit.com" "tasty.co" "healthline.com" "webmd.com" "mayoclinic.org" "nih.gov"
    "weather.com" "accuweather.com" "wunderground.com" "bbc.com/weather" "noaa.gov" "timeanddate.com" "time.com" "rollingstone.com" "variety.com" "hollywoodreporter.com"
)

# Configuration
CONCURRENCY=10  # Number of parallel requests
TIMEOUT=2       # Seconds to wait for each response
LOG_FILE="/tmp/dns_results.log"

# Clear previous logs
> "$LOG_FILE"

echo "--- Starting Parallel DNS Stress Test (100 Domains) ---"
echo "Concurrency: $CONCURRENCY | Timeout: $TIMEOUTs"

# Export the function so xargs can see it
do_lookup() {
    local domain=$1
    local log=$2
    local timeout=$3

    # Generate a random prefix (e.g., 4291.google.com)
    # This forces the DNS server to actually do a lookup instead of using cache.
    local random_prefix=$(head /dev/urandom | tr -dc a-z0-0 | head -c 4)
    local target="${random_prefix}.${domain}"

    # Change '192.168.1.1' to your actual Router IP to test the router
    # Or keep it as is to test your system's current default path
    if dig +short +time="$timeout" +tries=1 "$target" > /dev/null 2>&1; then
        echo "SUCCESS: $target" >> "$log"
    else
        echo "FAILED: $target" >> "$log"
    fi
}
export -f do_lookup

# Use xargs to run in parallel
printf "%s\n" "${DOMAINS[@]}" | xargs -I {} -P "$CONCURRENCY" bash -c "do_lookup {} $LOG_FILE $TIMEOUT"

# Calculate Results
TOTAL=${#DOMAINS[@]}
SUCCESSES=$(grep -c "SUCCESS" "$LOG_FILE")
FAILURES=$(grep -c "FAILED" "$LOG_FILE")

echo "--- Stress Test Complete ---"
echo "Total Domains Tested: $TOTAL"
echo "Successes: $SUCCESSES"
echo "Failures:  $FAILURES"
echo "Success Rate: $(( (SUCCESSES * 100) / TOTAL ))%"

if [ "$FAILURES" -gt 0 ]; then
    echo -e "\nFailed Domains:"
    grep "FAILED" "$LOG_FILE" | cut -d' ' -f2
fi