SmoothWall Express 3.0 is a free, open-source Linux-based firewall/router operating system designed to protect networks from unauthorized access, viruses, and other security threats. It provides network security by monitoring and filtering incoming and outgoing network traffic, and includes features like VPN support, web content filtering, and intrusion detection. SmoothWall Express 3.0 can be installed on a dedicated hardware appliance or on a virtual machine, and is suitable for small to medium-sized businesses, educational institutions, and home networks.

The Express 3.0 is a router manufactured by the company SmoothWall that allows multiple devices to connect to a network and communicate with each other. It works by receiving data packets from devices and forwarding them to their intended destination. The router is assigned a unique IP address 192.168.0.1, which serves as its identifier on the network.

To access the router's settings and configure its functions, users can log in using a web browser and their admin and unknown. Once logged in, users can customize various settings such as network name, password, and security protocols. They can also set up parental controls, prioritize bandwidth usage, and monitor network activity.