ZyXEL Communications P-334 - Manual (Page 323)

Prestige 334 User’s Guide
Chapter 34 VPN/IPSec Setup 322
Figure 180 Menu 27.1.1.1 IKE Setup
The following table describes the fields in this menu.
Menu 27.1.1.1 - IKE Setup
Phase 1
Negotiation Mode= Main
Pre-Shared Key= ?
Encryption Algorithm= DES
Authentication Algorithm= MD5
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:
Press Space Bar to Toggle.
Table 106 Menu 27.1.1.1 IKE Setup
FIELD DESCRIPTION
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.
PSK Prestige 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, includ-
ing spaces, but trailing spaces are truncated.
Both ends of the VPN tunnel must use the same pre-shared key. You will receive a
“PYLD_MALFORMED” (payload malformed) packet if the same pre-shared key is
not used on both ends.
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. Prestige DES encryption algo-
rithm 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.
Press [SPACE BAR] to choose from 3DES or DES and then press [ENTER].