kREproxy - kernel reverse proxy server. This is very simple proxy server of http protocol which use simple configuration to deciding where pass the http requests. kREproxy server works in linux kernel spaca as kernelmodule.
The Firewall Configurator for Webmin is a Webmin module written in Perl/CGI. It helps to build rules for common proxy server Squid and common paketfilter Iptables ( linux kernel 2.4.x ).