Comtun - It allows you to share one single Internet connection among different client.

Use Comtun in your local network as a simple proxy/firewall server to Connect to the Internet. It allows you to share one single Internet connection among different client computers( using TCP/IP protocol) in your local network. The connection can be Dial-Up Networking, ISDN, xDSL, cable modem connection, and any other types which are used by a single computer to access the Internet. It is the only software that features HTTP, NAT, SOCKS 4/5 server, DNS server, Telnet, FTP, POP3 and SMTP email, RealAudio, Port Mapping, VPN(PPTP and IPSec), DHCP server and Dial-Up remote control together yet with sufficient simplicity for ALL Windows platform. With the NAT technology, there is virtually no setup requirements for most of Internet software. Comtun can be used in your home, small business, even in an enterprise Company. After you install and start running Comtun from one of your computers which connects direct to the Internet , all other computers will share the same connection by TCP/IP, thus your computer becomes a gateway Between the Internet and your local network. Since the gateway machine acts as a firewall by only opening a few well-known ports, no other users on Internet can access your LAN, thus Comtun protects you from the attack of Internet hackers. You don`t have to use this gateway exclusively for Comtun, you can run other software applications on this host because all the connection traffics are in the background. Comtun supports DNS request routing for your local network. It is very likely that your ISP (Internet Service provider) has provided DNS (Domain Name Service) to you, so that an ALPHA-numeric web address (e.g. www.yahoo.com) can be translated to a pure numeric IP address (e.g. 204.71.200.75). This is required by some Internet applications. Comtun automatically routes all those requests to your Default DNS server or any other DNS servers Comtun can find (up to three external DNS servers).