xl2tpd is an implementation of the Layer 2 Tunnelling Protocol (RFC 2661), which works by opening a pseudo-tty for communicating with pppd. L2TP allows you to tunnel PPP over UDP. Some ISPs use L2TP to tunnel user sessions from dial-in servers (modem banks, ADSL DSLAMs) to back-end PPP servers. Another important application is Virtual Private Networks where the IPsec protocol is used to secure the L2TP connection (L2TP/IPsec, RFC 3193).
WWW: http://www.xelerance.com/services/software/xl2tpd/
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