P-2608HWL-Dx Series User’s Guide
Chapter 18 IPSec VPN
221
C
H A P T E R
18
IPSec VPN
This chapter explains how tos set up and maintain IPSec VPNs in the ZyXEL Device.
18.1 IPSec VPN Overview
A virtual private network (VPN) provides secure communications between sites without the
expense of leased site-to-site lines. A secure VPN is a combination of tunneling, encryption,
authentication, access control and auditing. It is used to transport traffic over the Internet or
any insecure network that uses TCP/IP for communication.
Internet Protocol Security (IPSec) is a standards-based VPN that offers flexible solutions for
secure data communications across a public network like the Internet. IPSec is built around a
number of standardized cryptographic techniques to provide confidentiality, data integrity and
authentication at the IP layer.
The following figure is one example of a VPN tunnel.
Figure 119
VPN: Example
The VPN tunnel connects the ZyXEL Device (
X
) and the remote IPSec router (
Y
). These
routers then connect the local network (
A
) and remote network (
B
).
A VPN tunnel is usually established in two phases. Each phase establishes a security
association (SA), a contract indicating what security parameters the ZyXEL Device and the
remote IPSec router will use. The first phase establishes an Internet Key Exchange (IKE) SA
between the ZyXEL Device and remote IPSec router. The second phase uses the IKE SA to
securely establish an IPSec SA through which the ZyXEL Device and remote IPSec router can
send data between computers on the local network and remote network. This is illustrated in
the following figure.
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Страница 44: ...P 2608HWL Dx Series User s Guide 44 Chapter 1 Getting To Know the ZyXEL Device ...
Страница 66: ...P 2608HWL Dx Series User s Guide 66 Chapter 3 Internet and Wireless Setup Wizard ...
Страница 72: ...P 2608HWL Dx Series User s Guide 72 Chapter 4 VoIP Wizard And Example ...
Страница 78: ...P 2608HWL Dx Series User s Guide 78 Chapter 5 Bandwidth Management Wizard ...
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Страница 166: ...P 2608HWL Dx Series User s Guide 166 Chapter 11 SIP ...
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Страница 206: ...P 2608HWL Dx Series User s Guide 206 Chapter 16 Firewall Configuration Figure 107 Firewall Edit Rule ...
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Страница 257: ...P 2608HWL Dx Series User s Guide Chapter 19 Certificates 257 Figure 138 My Certificate Details ...
Страница 268: ...P 2608HWL Dx Series User s Guide 268 Chapter 19 Certificates Figure 146 Trusted Remote Host Details ...
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Страница 288: ...P 2608HWL Dx Series User s Guide 288 Chapter 21 Bandwidth Management ...
Страница 292: ...P 2608HWL Dx Series User s Guide 292 Chapter 22 Dynamic DNS Setup ...
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Страница 318: ...P 2608HWL Dx Series User s Guide 318 Chapter 24 Universal Plug and Play UPnP ...
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Страница 378: ...P 2608HWL Dx Series User s Guide 378 Appendix B Setting up Your Computer s IP Address ...
Страница 402: ...P 2608HWL Dx Series User s Guide 402 Appendix F Triangle Route ...
Страница 440: ...P 2608HWL Dx Series User s Guide 440 Appendix H Internal SPTGEN ...