ZyXEL UAG4100 User Guide - Page 338
Virtual Private Networks VPN Overview
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CHAPTER 30 IPSec VPN 30.1 Virtual Private Networks (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. IPSec VPN Internet Protocol Security (IPSec) VPN connects IPSec routers or remote users using IPSec client software. This standards-based VPN offers flexible solutions for secure data communications across a public network. IPSec is built around a number of standardized cryptographic techniques to provide confidentiality, data integrity and authentication at the IP layer. The UAG can also combine multiple IPSec VPN connections into one secure network. Here local UAG X uses an IPSec VPN tunnel to remote (peer) UAG Y to connect the local (A) and remote (B) networks. Figure 239 IPSec VPN Example 30.1.1 What You Can Do in this Chapter • Use the VPN Connection screens (see Section 30.2 on page 340) to specify which IPSec VPN gateway an IPSec VPN connection policy uses, which devices behind the IPSec routers can use the VPN tunnel, and the IPSec SA settings (phase 2 settings). You can also activate or deactivate and connect or disconnect each VPN connection (each IPSec SA). • Use the VPN Gateway screens (see Section 30.3 on page 347) to manage the UAG's VPN gateways. A VPN gateway specifies the IPSec routers at either end of a VPN tunnel and the IKE SA settings (phase 1 settings). You can also activate and deactivate each VPN gateway. UAG Series User's Guide 338