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Prestige 662H/HW Series User’s Guide

Chapter 45 VPN/IPSec Setup

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Menu 27.1.1.1KE 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 = AES
            Authentication Algorithm = SHA1
            SA Life Time (Seconds)= 28800
            Key Group= DH1
          Phase 2
            Active Protocol  = ESP
            Encryption Algorithm  = AES
            Authentication Algorithm  = MD5
            SA Life Time (Seconds)= 28800
            Encapsulation  = Tunnel
            Perfect Forward Secrecy (PFS)= None
Press ENTER to Confirm or ESC to Cancel:

Table 151   Menu 27.1.1.1 IKE Setup

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. 

Pre-Shared Key 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, including 

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

The Prestige and the remote IPSec router generate an encryption key from the Diffie-

Hellman key exchange. Prestige 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.
This implementation of AES uses a 128-bit key. AES is faster than 3DES.
Press [SPACE BAR] to choose from DES, 3DES or AES and then press [ENTER].

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 slightly slower.
Press [SPACE BAR] to choose from SHA1 or MD5 and then press [ENTER].

SA Life Time 

(Seconds)

Define the length of time before an IKE Security Association automatically 

renegotiates in this field. It may range from 60 to 3,000,000 seconds (almost 35 days).
A short SA Life Time increases security by forcing the two VPN gateways to update 

the encryption and authentication keys. However, every time the VPN tunnel 

renegotiates, all users accessing remote resources are temporarily disconnected.