ZyXEL Communications 10 - Manual (Page 377)

ZyWALL 10~100 Series Internet Security Gateway
VPN/IPSec Setup 29-19
secret (which may have security implications in the long run) but allows faster SA setup (by bypassing the
Diffie-Hellman key exchange).
Figure 29-9 Menu 27.1.1.1: IKE Setup
Table 29-9 Menu 27.1.1.1: IKE Setup
FIELD DESCRIPTION EXAMPLE
Phase 1
Negotiation
Mode
Press [SPACE BAR] to choose from Main or Aggressive and then press
[ENTER]. See earlier for a discussion of these modes. Multiple SAs
connecting through a secure gateway must have the same negotiation mode. Main
Pre-Shared
Key
ZyWALL gateways authenticate an IKE VPN session by matching pre-shared
keys. Pre-shared keys are best for small networks with fewer than ten nodes.
Enter your pre-shared key here. Enter up to 31 characters. Any character may
be used, including spaces, but trailing spaces are truncated. Multiple SAs
connecting through a secure gateway must have the same pre-shared key.
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. ZyWALL
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 slightly increased latency and decreased throughput.
DES
Menu 27.1.1.1 - IKE Setup
Phase 1
Negotiation Mode= Main
Pre-Shared Key=
Encryption Algorithm = DES
Authentication Algorithm = SHA1
SA Life Time (Seconds)= 28800
Key Group= DH1
Phase 2
Active Protocol = ESP
Encryption Algorithm = DES
Authentication Algorithm = SHA1
SA Life Time (Seconds)= 28800
Encapsulation = Tunnel
Perfect Forward Secrecy (PFS)= None
Press ENTER to Confirm or ESC to Cancel: