DNS

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• Networking
• DNS
• DNS Security

DNS

Documentation for this is incomplete. Contributions are happily considered! See this for potential alternatives.

Default DNS Configuration

kicksecure-network-conf

Linux Default DNS Mechanism

On Linux, DNS libraries read the /etc/resolv.conf file. A DNS-resolving client such as Unbound is optional and not strictly required for basic DNS resolution.

/etc/resolv.conf

• Purpose: The /etc/resolv.conf file is a standard configuration file in Linux systems used by DNS resolver libraries (like glibc) to determine how to perform DNS resolution.
• Contents: It typically contains information such as:
  • nameserver directives specifying the IP addresses of DNS servers.
  • search domains and options for resolving queries.

DNS Resolver Libraries

• These libraries are part of most Linux systems and use /etc/resolv.conf to send DNS queries to the specified nameservers.
• The libraries themselves handle basic DNS resolution without needing an external DNS resolver client.

DNS Resolver Clients

E.g., unbound, systemd-resolved.

• Optional: External DNS resolving software like unbound or systemd-resolved is not strictly required for basic DNS resolution.
• Purpose: These tools provide additional functionality, such as caching, advanced DNSSEC validation, or recursive DNS resolution.
• Integration: When such a resolver is used, /etc/resolv.conf might point to 127.0.0.1 (localhost), as the local resolver handles DNS queries before forwarding them.

Summary

• Basic DNS resolution on Linux relies on resolver libraries using /etc/resolv.conf.
• External DNS resolving clients like unbound are optional and primarily used to enhance DNS functionality. They are not required for basic operations if a valid nameserver is defined in /etc/resolv.conf.

Enabling systemd-resolved

Untested!

Warning: This is for testers-only!

Advanced users only!

sudo touch /etc/dns-enable

sudo apt install systemd-resolved

sudo systemctl enable systemd-resolved

sudo systemctl start systemd-resolved

Kicksecure A secure by default operating system with the latest security research in place.

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