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DNS (Domain Name System) translates human-readable domain names into IP addresses. Traditional DNS queries are sent in plaintext, making them vulnerable to eavesdropping, spoofing, and censorship. DNS over HTTPS (DoH) and DNS over TLS (DoT) encrypt DNS traffic, enhancing privacy and security.
You Should Know:
1. Enabling DoH/DoT on Linux (systemd-resolved)
Most modern Linux distributions use `systemd-resolved` for DNS resolution. Configure DoT:
sudo nano /etc/systemd/resolved.conf
Add/modify:
[bash] DNS=1.1.1.1 9.9.9.9 DNSOverTLS=yes
Restart the service:
sudo systemctl restart systemd-resolved
Verify:
sudo resolvectl status
2. Using DoH with `curl` (Manual Testing)
Test DoH manually:
curl --doh-url https://cloudflare-dns.com/dns-query https://example.com
3. Configuring Firefox for DoH
1. Open Firefox → Settings → Network Settings
2. Enable DNS over HTTPS
3. Select a provider (Cloudflare, NextDNS, etc.)
4. Windows (DoH via PowerShell)
Enable DoH:
Set-DnsClientDohServerAddress -ServerAddress "1.1.1.1" -DohTemplate "https://cloudflare-dns.com/dns-query" -AllowFallbackToUdp $false
Check status:
Get-DnsClientDohServerAddress
5. Blocking Plaintext DNS (Linux iptables)
Prevent accidental DNS leaks:
sudo iptables -A OUTPUT -p udp --dport 53 -j DROP sudo iptables -A OUTPUT -p tcp --dport 53 -j DROP
6. Verifying DNS Encryption
Check for leaks:
tcpdump -i eth0 -n port 53
Or use online tools like DNSLeakTest.
What Undercode Say:
DNS encryption is crucial for privacy, but it doesn’t make you anonymous. Combine DoH/DoT with VPNs or Tor for stronger anonymity. Always verify DNS settings and block plaintext DNS to prevent leaks.
Prediction:
As surveillance increases, ISPs and governments may attempt to block DoH/DoT, leading to more advanced DNS obfuscation techniques like DNS over QUIC (DoQ) or decentralized DNS solutions.
Expected Output:
- Encrypted DNS queries
- No plaintext DNS leaks
- Improved privacy against ISP tracking
Relevant URLs:
IT/Security Reporter URL:
Reported By: Sam Bent – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
