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DNS-over-TLS (DoT) is a security protocol that encrypts DNS traffic between clients and resolvers. It ensures the confidentiality and integrity of DNS queries and responses, protecting against eavesdropping and tampering. While DNS-over-TLS is not natively supported in all Linux distributions, there are alternative methods to implement it.
One popular option is to use Stubby, a DNS privacy application that acts as a local DNS stub resolver. Stubby supports DNS-over-TLS and can be easily configured to forward DNS queries to a DNS-over-TLS capable resolver.
To implement DNS-over-TLS using Stubby in a Linux environment, follow these steps:
1. Install Stubby:
sudo apt-get install stubby
2. Configure Stubby:
Edit the Stubby configuration file /etc/stubby/stubby.yml
using a text editor. Uncomment the following lines and modify them as needed:
resolution_type: GETDNS_RESOLUTION_STUB
dns_transport_list:
- GETDNS_TRANSPORT_TLS
tls_authentication: GETDNS_AUTHENTICATION_REQUIRED
tls_query_padding_blocksize: 128
upstream_recursive_servers:
- address_data: 1.1.1.1
tls_auth_name: "cloudflare-dns.com"
- address_data: 9.9.9.9
tls_auth_name: "dns.quad9\.net"
3. Restart Stubby:
sudo systemctl restart stubby
4. Configure the system to use Stubby as the DNS resolver:
Edit the /etc/resolv.conf
file and set the DNS server to 127.0.0.1
:
nameserver 127.0.0.1
Note: Some Linux distributions dynamically generate the /etc/resolv.conf
file. In such cases, you may need to modify the network configuration files to set the DNS server to 127.0.0.1
.
5. Test DNS-over-TLS:
Use the dig
command to perform a DNS query and verify that it is using DNS-over-TLS:
dig example.com
Look for the flags
section in the output. If you see flags: qr rd ra ad
, it indicates that DNS-over-TLS is working.