dnsmasq

To configure dnsmasq, you modify the `dnsmasq.conf` file or drop-in files to set up interface binding, static leases, upstream resolvers, and local domain resolution, then reload the service to apply changes.

DHCP failures in dnsmasq are often caused by port conflicts, incorrect interface binding, or configuration syntax errors; you can diagnose these by checking the service status, validating the configuration syntax, and reviewing logging output.

Yes, dnsmasq supports sinkhole and blocking configurations, allowing you to prevent local network clients from resolving specified domains by modifying the dnsmasq configuration files and reloading the service.

The best way to test dnsmasq configuration syntax is to run a syntax check command before restarting the service, ensuring that your `dnsmasq.conf` or drop-in files are valid and preventing service disruptions from misconfigurations.

To set up static DHCP leases in dnsmasq, you add specific entries to the `dnsmasq.conf` file mapping client MAC addresses to fixed IP addresses, then reload the service to enforce the static assignments.

If dnsmasq fails to start due to a port conflict, you must identify and stop the competing service using port 53, then verify your dnsmasq interface binding settings before attempting to restart the service.