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Lecture TCP-IP protocol suite (3/e): Chapter 26 - Behrouz Forouzan

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Chapter 26 - Virtual private networks and network address translation. 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. | Chapter 26 Upon completion you will be able to: Virtual Private Networks and Network Address Translation 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 Objectives 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 | Chapter 26 Upon completion you will be able to: Virtual Private Networks and Network Address Translation 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 Objectives 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 .