Chapter 18 VPN Screens

Table 96 Edit VPN Policies

LABEL

DESCRIPTION

Secure Gateway

Type the WAN IP address or the URL (up to 31 characters) of the IPSec router

Address

with which you're making the VPN connection. Set this field to 0.0.0.0 if the

 

remote IPSec router has a dynamic WAN IP address (the Key Management field

 

must be set to IKE).

 

In order to have more than one active rule with the Secure Gateway Address

 

field set to 0.0.0.0, the ranges of the local IP addresses cannot overlap between

 

rules.

 

If you configure an active rule with 0.0.0.0 in the Secure Gateway Address field

 

and the LAN’s full IP address range as the local IP address, then you cannot

 

configure any other active rules with the Secure Gateway Address field set to

 

0.0.0.0.

 

 

Security Protocol

 

 

 

VPN Protocol

Select ESP if you want to use ESP (Encapsulation Security Payload). The ESP

 

protocol (RFC 2406) provides encryption as well as some of the services offered

 

by AH. If you select ESP here, you must select options from the Encryption

 

Algorithm and Authentication Algorithm fields (described below).

 

 

Pre-Shared Key

Click the button to use a pre-shared key for authentication, and type in your pre-

 

shared key. 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.

 

 

Certificate

Click the button to use a certificate for authentication. Select the certificate you

 

want to use from the list. You can create, import and configure certificates in the

 

Security > Certificates screens, or click the My Certificates link.

 

 

My Certificates

Click this to go to the Security > Certificates > My Certificates screen. If you do

 

not click Apply first, your VPN settings will not be saved.

 

 

Encryption

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

Algorithm

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

Select SHA1 or MD5 from the drop-down list box. MD5 (Message Digest 5) and

Algorithm

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 SHA-1for maximum security.

 

 

Advanced Setup

Click Advanced to configure more detailed settings of your IKE key

 

management.

 

 

Back

Click Back to return to the previous screen.

 

 

Apply

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

 

 

 

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P-2602H(W)(L)-DxA User’s Guide