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Chapter 4 Wizard Setup
ZyWALL USG 300 User’s Guide
104
Figure 39 VPN Advanced Wizard: Step 3
The following table describes the labels in this screen.
Table 19 VPN Advanced Wizard: Step 3
LABEL DESCRIPTION
Negotiation Mode Select Main for identity protection. Select Aggressive to allow more incoming
connections from dynamic IP addresses to use separate passwords.
Note: Multiple SAs (security associations) connecting through a
secure gateway must have the same negotiation mode.
Encryption
Algorithm
When DES is used for data communications, both sender and receiver must
know the same secret key, which can be used to encrypt and decrypt the
message or to generate and verify a message authentication code. The DES
encryption algorithm uses a 56-bit key. Triple DES (3DES) is a variation on DES
that uses a 168-bit key. As a result, 3DES is more secure than DES. It also
requires more processing power, resulting in increased latency and decreased
throughput. AES128 uses a 128-bit key and is faster than 3DES. AES192 uses
a 192-bit key and AES256 uses a 256-bit key. Select Null to have no
encryption.
Authentication
Algorithm
MD5 (Message Digest 5) and SHA1 (Secure Hash Algorithm) are hash
algorithms used to authenticate packet data. The SHA1 algorithm is generally
considered stronger than MD5, but is slower. Select MD5 for minimal security
and SHA1 for maximum security.
Key Group You must choose a key group for phase 1 IKE setup. 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.