Short description of Comtun Pro 4.5a: Proxy/Firewall for internet connection sharing. Advanced features useful for both business and home use. With support for access control and banner blocking, you have ultimate control of your connection. A fully customizable firewall protects you from hackers, and works seemlessly with the proxy. ComTun uses NAT to give clients a transparent connection to the Internet and includes HTTP caching proxy and authentication. Built-in DHCP server.