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+xl2tpd is an implementation of the Layer 2 Tunnelling Protocol (RFC 2661).
+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). The L2TP/IPsec protocol is mainly used by Windows and
+Mac OS X clients. On Linux, xl2tpd can be used in combination with IPsec
+implementations such as Openswan.
+Example configuration files for such a setup are included in this RPM.
+
+xl2tpd works by opening a pseudo-tty for communicating with pppd.
+It runs completely in userspace but supports kernel mode L2TP.
+
+xl2tpd supports IPsec SA Reference tracking to enable overlapping internak
+NAT'ed IP's by different clients (eg all clients connecting from their
+linksys internal IP 192.168.1.101) as well as multiple clients behind
+the same NAT router.
+
+xl2tpd supports the pppol2tp kernel mode operations on 2.6.23 or higher,
+or via a patch in contrib for 2.4.x kernels. Note that kernel mode and
+IPsec SA Reference tracking do not yet work together.