A Multi-tunnel VPN Concurrent System for New Generation Network Based on User Space

In the existing large-scale performance test of IPsec tunnel, it often needs special software and hardware. To solve the problem, this article proposed a new method, in which packet was encapsulated in user space, and a multi-tunnel controller was designed and implemented with the method of FSM(finite state machine), which controlled the negotiation and establishment of multiple tunnel, including L2tp, IKEv1, IKEv2, IKEv2+EAP and L2tp Over IPsec. Libpcap was used as the bottom layer driver of package, and the application of zero copy technique had reduced system cost immensely. At last, the result of the experiment verified the performance of the IKEv1 tunnel on Tunnel-mode and Transport-mode.