Virtual Private Networks and Network Address Translation

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Presentation transcript:

Virtual Private Networks and Network Address Translation Chapter 26 Virtual Private Networks and Network Address Translation Objectives Upon completion you will be able to: Understand the difference between an internet and an extranet Understand private, hybrid, and virtual private networks Understand how VPN can guarantee privacy Understand the mechanism of NAT TCP/IP Protocol Suite

26.1 PRIVATE NETWORKS A private network is designed to be used only inside an organization. It allows access to shared resources and, at the same time, provides privacy. The topics discussed in this section include: Intranet Extranet Addressing TCP/IP Protocol Suite

Table 26.1 Addresses for private networks TCP/IP Protocol Suite

26.2 VIRTUAL PRIVATE NETWORKS (VPN) Virtual private network (VPN) is a technology for large organizations that use the global Internet for both intra- and interorganization communication, but require privacy in their intraorganization communication. The topics discussed in this section include: Achieving Privacy VPN Technology TCP/IP Protocol Suite

Figure 26.1 Private network TCP/IP Protocol Suite

Figure 26.2 Hybrid network TCP/IP Protocol Suite

Figure 26.3 Virtual private network TCP/IP Protocol Suite

Figure 26.4 Tunneling TCP/IP Protocol Suite

Figure 26.5 Addressing in a VPN TCP/IP Protocol Suite

26.3 NETWORK ADDRESS TRANSLATION (NAT) Network address translation (NAT) allows a site to use a set of private addresses for internal communication and a set of global Internet addresses for communication with another site. The site must have only one single connection to the global Internet through a router that runs NAT software. The topics discussed in this section include: Address Translation Translation Table NAT and ISP TCP/IP Protocol Suite

Figure 26.6 NAT TCP/IP Protocol Suite

Figure 26.7 Address translation TCP/IP Protocol Suite

Figure 26.8 Translation TCP/IP Protocol Suite

Table 26.2 Five-column translation table TCP/IP Protocol Suite

Figure 26.9 An ISP and NAT TCP/IP Protocol Suite