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TCP/IP Protocol Suite 1
Chapter 26Chapter 26
Upon completion you will be able to:
Virtual Private Networks andVirtual Private Networks andNetwork Address Translation 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
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TCP/IP Protocol Suite 2
26.1 PRIVATE NETWORKS
A private network is designed to be used only inside an organization. It A private network is designed to be used only inside an organization. It allows access to shared resources and, at the same time, provides allows access to shared resources and, at the same time, provides privacy.privacy.
The topics discussed in this section include:The topics discussed in this section include:
Intranet Intranet Extranet Extranet Addressing Addressing
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TCP/IP Protocol Suite 3
Table 26.1 Table 26.1 Addresses for private networksAddresses for private networks
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TCP/IP Protocol Suite 4
26.2 VIRTUAL PRIVATE NETWORKS (VPN)
Virtual private network (VPN) is a technology for large organizations Virtual private network (VPN) is a technology for large organizations that use the global Internet for both intra- and interorganization that use the global Internet for both intra- and interorganization communication, but require privacy in their intraorganization communication, but require privacy in their intraorganization communication. communication.
The topics discussed in this section include:The topics discussed in this section include:
Achieving Privacy Achieving Privacy VPN Technology VPN Technology
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TCP/IP Protocol Suite 5
Figure 26.1 Private network
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TCP/IP Protocol Suite 6
Figure 26.2 Hybrid network
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TCP/IP Protocol Suite 7
Figure 26.3 Virtual private network
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TCP/IP Protocol Suite 8
Figure 26.4 Tunneling
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TCP/IP Protocol Suite 9
Figure 26.5 Addressing in a VPN
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TCP/IP Protocol Suite 10
26.3 NETWORK ADDRESS TRANSLATION (NAT)
Network address translation (NAT) allows a site to use a set of private 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 internal communication and a set of global Internet addresses for communication with another site. The site must have only addresses for communication with another site. The site must have only one single connection to the global Internet through a router that runs one single connection to the global Internet through a router that runs NAT software.NAT software.
The topics discussed in this section include:The topics discussed in this section include:
Address Translation Address Translation Translation Table Translation Table NAT and ISP NAT and ISP
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TCP/IP Protocol Suite 11
Figure 26.6 NAT
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TCP/IP Protocol Suite 12
Figure 26.7 Address translation
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TCP/IP Protocol Suite 13
Figure 26.8 Translation
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TCP/IP Protocol Suite 14
Table 26.2 Table 26.2 Five-column translation tableFive-column translation table
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TCP/IP Protocol Suite 15
Figure 26.9 An ISP and NAT