P-334U/P-335U User’s Guide

 

Table 52 Security > VPN > Rule Setup: IKE (Basic) (continued)

 

LABEL

DESCRIPTION

 

 

 

 

 

 

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

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

 

 

Algorithm

Choices are:

 

 

 

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

 

 

 

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

 

 

 

The ZyXEL Device 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

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

 

 

Algorithm

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 ZyXEL Device.

 

 

 

 

 

 

Reset

Click Reset to begin configuring this screen afresh.

 

 

 

 

 

13.5 Advanced VPN Rule Setup (IKE)

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

Chapter 13 IPSec VPN

153