Docker network issues can be caused by DNS configuration, incorrect bridge settings, or firewall rules. Check these configurations and Docker network setup.

Network connectivity issues in Docker containers are typically due to DNS misconfigurations, firewall restrictions, or issues with Docker’s network drivers. Start by testing basic network commands within the container, such as ping and curl, to identify where connectivity breaks down. For DNS issues, confirm the container’s DNS configuration by adding --dns <IP_address> to docker run, or specify a DNS in Docker’s daemon configuration file. If firewall settings on the host restrict Docker’s network bridge, adjust the rules to allow Docker-related traffic. For inter-container communication, ensure all containers are on the same Docker network by connecting them to a common network with docker network connect. If using custom bridge networks, inspect IP and subnet configurations to avoid conflicts. Troubleshoot by restarting Docker to reset network settings and verifying network drivers (e.g., bridge, overlay) are correctly set up for the intended communication method.