TAILIEUCHUNG - Internetworking with TCP/IP- P44

Internetworking with TCP/IP- P44: TCP/IP has accommodated change well. The basic technology has survived nearly two decades of exponential growth and the associated increases in traffic. The protocols have worked over new high-speed network technologies, and the design has handled applications that could not be imagined in the original design. Of course, the entire protocol suite has not remained static. New protocols have been deployed, and new techniques have been developed to adapt existing protocols to new network technologies | 20 Private Network Interconnection NAT VPN Introduction Previous chapters describe an internet as a single-level abstraction that consists of networks interconnected by routers. This chapter considers an alternative a two-level internet architecture in which each organization has a private internet and a centtal internet interconnects them. The chapter examines technologies used with a two-level architecture. One solves the pragmatic problem of limited address space and the other offers increased functionality in the form of privacy that prevents outsiders from viewing the data. Private And Hybrid Networks One of the major drawbacks of a single-level internet architecture is the lack of privacy. If an organization comprises multiple sites the contents of datagrams that travel across the Internet between the sites can be viewed by outsiders because they pass across networks owned by other organizations. A two-level architecture distinguishes between internal and external datagrams . datagrams sent between two computers within an organization and datagrams sent between a computer in the organization and a computer in another organization . The goal is to keep internal datagrams private while still allowing external communication. The easiest way to guarantee privacy among an organization s computers consists of building a completely isolated private internet which is usually referred to as a 389 390 Private Network Interconnection NAT VPN Chap. 20 private network. That is an organization builds its own TCP IP internet separate from the global Internet. A private network uses routers to interconnect networks at each site and leased digital circuits to interconnect the sites. All data remains private because no outsiders have access to any part of a private network. Furthermore because the private network is isolated from the global Internet it can use arbitrary IP addresses. Of course complete isolation is not always desirable. Thus many organizations .

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