Mpd is a netgraph(4) based implementation of the multi-link PPP protocol for FreeBSD. It is designed to be both fast and flexible. It handles configuration and negotiation in user land, while routing all data packets strictly in the kernel. It supports several of the numerous PPP sub-protocols and extensions, such as: Multi-link PPP capability PAP, CHAP, and MS-CHAP authentication PPP compression and encryption Point-to-Point Tunnelling Protocol (PPTP) Mpd also includes many additional features: Dial-on-demand with idle timeout Multiple active connections running simultaneously Dynamic demand based link management (also known as ``rubber bandwidth'') Powerful chat scripting language for asynchronous serial ports Pre-tested chat scripts for automatic configuration of several common modems and ISDN terminal adapters Clean device-type independent design Comprehensive logging WWW: http://www.dellroad.org/mpd/