ZyXEL UAG715 User Guide - Page 253
IPSec VPN
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CHAPTER 22 IPSec VPN 22.1 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 173 IPSec VPN Example SSL VPN SSL VPN uses remote users' web browsers to provide the easiest-to-use of the UAG's VPN solutions. A user just browses to the UAG's web address and enters his user name and password to securely connect to the UAG's network. Remote users do not need to configure security settings. Here a user uses his browser to securely connect to network resources in the same way as if he were part of the internal network. See Chapter 23 on page 285 for more on SSL VPN. UAG715 User's Guide 253