ZyXEL P-792H v2 User Guide - Page 155
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CHAPTER 12 VPN 12.1 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 an example of an IPSec VPN tunnel. Figure 69 VPN: Example Internet VPN Tunnel X Y 12.1.1 What You Can Do in the VPN Screens • Use the Setup screen (Section 12.2 on page 157) to view the configured VPN policies and add, edit or remove a VPN policy. • Use the Monitor screen (Section 12.7 on page 171) to display and manage the current active VPN connections. • Use the VPN Global Setting screen (Section 12.8 on page 172) to allow NetBIOS packets passing through the VPN connection. P-792H v2 User's Guide 155