<P> According to figures released by the company, Smoothwall currently has over 1 million active installations worldwide . </P> <P> Smoothwall Express, originally Smoothwall GPL, is the freely distributable version of Smoothwall, developed by the Smoothwall Open Source Project team and members of Smoothwall Ltd . </P> <P> Released in August 2000, Smoothwall GPL was developed by Lawrence Manning and Richard Morrell to provide a quick and easy - to - use solution to the problem of sharing their ISDN connections with the rest of their LAN . Created using Red Hat Linux, Smoothwall GPL originally had two simple functions: control the modem to dial and hang up, and to route TCP / IP packets from the LAN to the Internet connection, and back again . The LAN was hidden from the public network by NAT, applied using ipchains . </P> <P> Beginning with 0.9 in August 2000, the Smoothwall GPL 0.9. x series went through several versions based on the 2.2 Linux kernel, culminating in 0.9. 9 SE in December 2001, which was probably the most popular GPL release . Each release led to a number of improvements, including PAT (port address translation), DMZ, PSTN and ISDN dial - up support, broadband (ADSL and Cable) support . </P>

What version of linux is smoothwall based on