ZyXEL USG110/210/310 User Guide - Page 606
SSL VPN
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Chapter 30 IPSec VPN shared key (shared secret), signatures, or public key encryption. Phase 1 operates in either Main Mode or Aggressive Mode. Main Mode protects the identity of the peers, but Aggressive Mode does not. During Phase 2, the remote IPSec routers use the secure channel established in Phase 1 to negotiate Security Associations for IPSec. The negotiation results in a minimum of two unidirectional security associations (one inbound and one outbound). Phase 2 uses Quick Mode (only). Quick mode occurs after IKE has established the secure tunnel in Phase 1. It negotiates a shared IPSec policy, derives shared secret keys used for the IPSec security algorithms, and establishes IPSec SAs. Quick mode is also used to renegotiate a new IPSec SA when the IPSec SA lifetime expires. In the Zyxel Device, use the VPN Connection tab to set up Phase 2 and the VPN Gateway tab to set up Phase 1. Some differences between IKEv1 and IKEv2 include: • IKEv2 uses less bandwidth than IKEv1. IKEv2 uses one exchange procedure with 4 messages. IKEv1 uses two phases with Main Mode (9 messages) or Aggressive Mode (6 messages) in phase 1. • IKEv2 supports Extended Authentication Protocol (EAP) authentication, and IKEv1 supports X-Auth. EAP is important when connecting to existing enterprise authentication systems. • IKEv2 always uses NAT traversal and Dead Peer Detection (DPD), but they can be disabled in IKEv1 using Zyxel Device firmware (the default is on). • Configuration payload (includes the IP address pool in the VPN setup data) is supported in IKEv2 (off by default), but not in IKEv1. • Narrowed is supported in IKEv2, but not in IKEv1. Narrowed has the SA apply only to IP addresses in common between the Zyxel Device and the remote IPSec router. • The IKEv2 protocol supports connectivity checks which is used to detect whether the tunnel is still up or not. If the check fails (the tunnel is down), IKEv2 can re-establish the connection automatically. The Zyxel Device uses firmware to perform connectivity checks when using IKEv1. SSL VPN SSL VPN uses remote users' web browsers to provide the easiest-to-use of the Zyxel Device's VPN solutions. A user just browses to the Zyxel Device's web address and enters his user name and password to securely connect to the Zyxel Device'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 31 on page 641 for more on SSL VPN. Figure 427 SSL VPN LAN (192.168.1.X) https:// Web Mail File Share Non-Web Web-based Application Application Server ZyWALL USG Series User's Guide 606
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