ZyXEL UAG4100 User Guide - Page 76
VPN Advanced Wizard - Phase 2
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Chapter 5 Quick Setup Wizards • Key Group: DH5 is more secure than DH1 or DH2 (although it may affect throughput). DH1 (default) refers to Diffie-Hellman Group 1 a 768 bit random number. DH2 refers to Diffie-Hellman Group 2 a 1024 bit (1Kb) random number. DH5 refers to Diffie-Hellman Group 5 a 1536 bit random number. • SA Life Time: Set how often the UAG renegotiates the IKE SA. A short SA life time increases security, but renegotiation temporarily disconnects the VPN tunnel. • NAT Traversal: Select this if the VPN tunnel must pass through NAT (there is a NAT router between the IPSec devices). Note: The remote IPSec device must also have NAT traversal enabled. See the help in the main IPSec VPN screens for more information. • Dead Peer Detection (DPD) has the UAG make sure the remote IPSec device is there before transmitting data through the IKE SA. If there has been no traffic for at least 15 seconds, the UAG sends a message to the remote IPSec device. If it responds, the UAG transmits the data. If it does not respond, the UAG shuts down the IKE SA. • Authentication Method: Select Pre-Shared Key to use a password or Certificate to use one of the UAG's certificates. 5.3.9 VPN Advanced Wizard - Phase 2 Phase 2 in an IKE uses the SA that was established in phase 1 to negotiate SAs for IPSec. Figure 54 VPN Advanced Wizard: Phase 2 Settings • Active Protocol: ESP is compatible with NAT, AH is not. • Encapsulation: Tunnel is compatible with NAT, Transport is not. • Encryption Algorithm: 3DES and AES use encryption. The longer the AES key, the higher the security (this may affect throughput). Null uses no encryption. • Authentication Algorithm: MD5 gives minimal security and SHA512 gives the highest security. MD5 (Message Digest 5) and SHA (Secure Hash Algorithm) are hash algorithms used to authenticate packet data. The stronger the algorithm the slower it is. • SA Life Time: Set how often the UAG renegotiates the IKE SA. A short SA life time increases security, but renegotiation temporarily disconnects the VPN tunnel. UAG Series User's Guide 76