Research On Layer 2 Tunneling Protocols And Test For L2TPv2 LNS Software

With incessant extension of scale, range and embranchment organization ofcompany, the information, which is from the interior of company and anothercompanies, is fleetly increasing. The traditional commerce application on top of Internetcomes forth a great deal of problem: complex network, heavy management, safeinformation, costly expenses, basal establishment compatibility and so on. So theresearch institutions and the companies, which engage in information security, putforward a scheme, which makes use of the Layer Two Tunneling Protocol to constructVPN through the remote access system. This scheme is not only convenient for the userbut also save cost of the company.The Layer Two Tunneling Protocol (L2TP) provides a dynamic mechanism fortunneling Layer 2 (L2) "circuits" across a packet-oriented data network (e.g., over IP).L2TPv2 can only transmit PPP frame. It permits to establish the tunnel on top of allkinds of the network service including the layer two services. L2TPv3 extendsL2TPv2.The object transmitted is all kinds of second data frame, and its structureincludes not only c/s model but also Terminal/Terminal model and Server/Server model.The research on layer two tunneling protocol is the base and key of grasping protocolelements, completing software development and accomplishing network application.The test for software is the important step ensuring the software quality and actualapplication.This thesis introduces the basic knowledge of tunnel technique, particularlyanalyses and compares L2TPv3 with L2TPv2, describes the L2TP working mechanism,summarizes the different facts between L2TPv3 and L2TPv2, expounds the test for theL2TPv2 LNS software. In the end it not only concludes the research and the test, butalso points out the deficiencies and puts forward the improved advice.