Analysis on VPN Tunneling Techniques
虚拟专用网隧道技术分析

Tunneling technique is one of the key technologies in establishing virtual private network (VPN). In this paper, we perform a comparative research on various tunneling techniques including MPLS, IPSec, GRE, IP-in-IP, and L2TP. We can conclude the evolutive trend of utilizing tunneling techniques in VPN by analyzing them synthetically. Especially, it will probably become a key problem that guarantees the compatibility and interoperability between MPLS, IPSec and L2TP.