ZyXEL Communications P-324 User's Guide download pdf (Page 254)

P-2602HWNLI User’s Guide

254 Chapter 17 VPN Screens

17.12 IKE Phases

There are two phases to every IKE (Internet Key Exchange) negotiation – phase 1

(Authentication) and phase 2 (Key Exchange). A phase 1 exchange establishes an IKE SA and

the second one uses that SA to negotiate SAs for IPSec.

Figure 134 Two Phases to Set Up the IPSec SA

In phase 1 you must:

• Choose a negotiation mode.

Encryption

Algorithm

Select DES, 3DES, AES or NULL from the drop-down list box.

When you use one of these encryption algorithms for data communications, both

the sending device and the receiving device must use 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. This implementation of AES uses

a 128-bit key. AES is faster than 3DES.

Select NULL to set up a tunnel without encryption. When you select NULL, you

do not enter an encryption key.

Authentication

Algorithm

Select SHA1 or MD5 from the drop-down list box. 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.

Back Click Back to return to the previous screen.

Apply Click Apply to save your changes to the ZyXEL Device.

Cancel Click Cancel to begin configuring this screen afresh.

Advanced Setup Click Advanced Setup to configure more detailed settings of your IKE key

management.

Table 93 Edit VPN Policies

LABEL DESCRIPTION

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ZyXEL Communications P-324 User's Guide Page 254