ZyXEL NBG420N Manuel d'utilisateur télécharger pdf (Page 173)

Chapter 15 IPSec VPN

NBG420N User’s Guide

173

15.2.2 VPN Rule Setup (Advanced)

Click the Advanced... button in the Rule Setup screen to open this screen.

Use this screen to configure a VPN rule.

Pre-Shared Key Type your pre-shared key in this field. A pre-shared key identifies a

communicating party during a phase 1 IKE negotiation. It is called "pre-shared"

because you have to share it with another party before you can communicate

with them over a secure connection.

Type from 8 to 31 case-sensitive ASCII characters or from 16 to 62 hexadecimal

("0-9", "A-F") characters. You must precede a hexadecimal key with a "0x” (zero

x), which is not counted as part of the 16 to 62 character range for the key. For

example, in "0x0123456789ABCDEF", “0x” denotes that the key is hexadecimal

and “0123456789ABCDEF” is the key itself.

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

Select which key size and encryption algorithm to use for data communications.

Choices are:

DES - a 56-bit key with the DES encryption algorithm

3DES - a 168-bit key with the DES encryption algorithm

The NBG420N and the remote IPSec router must use the same algorithms and

key , which can be used to encrypt and decrypt the message or to generate and

verify a message authentication code. Longer keys require more processing

power, resulting in increased latency and decreased throughput.

Authentication

Algorithm

Select which hash algorithm to use to authenticate packet data. Choices are

SHA1 and MD5. SHA1 is generally considered stronger than MD5, but it is also

slower.

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

management.

Apply Click Apply to save your changes back to the NBG420N.

Reset Click Reset to begin configuring this screen afresh.

Cancel Click Cancel to exit the screen without making any changes.

Table 63 SECURITY > VPN > Rule Setup: IKE (Basic) (continued)

LABEL DESCRIPTION

1 2 ... 168 169 170 171 172 173 174 175 176 177 178 ... 339 340

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ZyXEL NBG420N Manuel d'utilisateur Page 173