L2TP is an industry standard Internet tunneling protocol. Its function is roughly similar to PPTP protocol. For example, it can also encrypt network data flow. However, there are also differences. For example, PPTP requires the network to be IP network, and L2TP requires packet oriented point-to-point connection; PPTP uses a single tunnel and L2TP uses multiple tunnels; L2TP provides header compression and tunnel verification, which PPTP does not support.