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Chapter 4 Quick Setup Wizards
ZyWALL 110/310/1100 Series User’s Guide
65
• Authentication Algorithm: MD5 (Message Digest 5) and SHA (Secure Hash Algorithm) are
hash algorithms used to authenticate packet data. MD5 gives minimal security. SHA1 gives
higher security and SHA256 gives the highest security. The stronger the algorithm, the slower it
is.
• 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 ZyWALL renegotiates the IKE SA. A short SA life time increases
security, but renegotiation temporarily disconnects the VPN tunnel.
• Authentication Method: Select Pre-Shared Key to use a password or Certificate to use one
of the ZyWALL’s certificates.
4.4.7 VPN Settings for Configuration Provisioning Advanced Wizard - Phase
2
Phase 2 in an IKE uses the SA that was established in phase 1 to negotiate SAs for IPSec.
Figure 48 VPN for Configuration Provisioning Advanced Wizard: Phase 2
• Active Protocol: ESP is compatible with NAT. AH is not available in this wizard.
• 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 (Message Digest 5) and SHA (Secure Hash Algorithm) are
hash algorithms used to authenticate packet data. MD5 gives minimal security. SHA1 gives
higher security and SHA256 gives the highest security. The stronger the algorithm, the slower it
is.
• SA Life Time: Set how often the ZyWALL renegotiates the IKE SA. A short SA life time increases
security, but renegotiation temporarily disconnects the VPN tunnel.
• Perfect Forward Secrecy (PFS): Disabling PFS allows faster IPSec setup, but is less secure.
Select DH1, DH2 or DH5 to enable PFS. DH5 is more secure than DH1 or DH2 (although it may
affect throughput). DH1 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 (more secure, yet slower).
• Local Policy (IP/Mask): Type the IP address of a computer on your network. You can also
specify a subnet. This must match the remote IP address configured on the remote IPSec device.