Docker container network troubleshooting steps: 1) check container network mode configuration (docker inspect); 2) verify port mapping is correct (docker port); 3) check if container is in the correct network (docker network inspect); 4) test internal container network connectivity (ping, curl); 5) check firewall rules and iptables; 6) verify DNS resolution is normal; 7) check overlay network configuration (cross-host scenarios); 8) use tcpdump to capture and analyze network traffic; 9) check if MTU settings match; 10) view Docker network logs. Common issues: port conflicts, DNS resolution failures, MTU mismatch, firewall blocking, overlay network configuration errors.