Prestige 334 User’s Guide

 

Table 51 VPN: Rule Setup (Basic)

 

 

 

 

 

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 IPSec Keying Mode

 

 

 

field must be set to IKE). The remote address fields do not apply when the

 

 

 

Secure Gateway Address field is configured to 0.0.0.0. In this case only the

 

 

 

remote IPSec router can initiate the VPN.

 

 

Peer ID Type

Select IP to identify the remote IPSec router by its IP address.

 

 

 

Select DNS to identify the remote IPSec router by a domain name.

 

 

 

Select E-mailto identify the remote IPSec router by an e-mail address.

 

 

 

 

 

 

Peer Content

The configuration of the peer content depends on the peer ID type.

 

 

 

For IP, type the IP address of the computer with which you will make the VPN

 

 

 

connection. If you configure this field to 0.0.0.0 or leave it blank, the Prestige will

 

 

 

use the address in the Secure Gateway Address field (refer to the Secure

 

 

 

Gateway Address field description).

 

 

 

For DNS or E-mail, type a domain name or e-mail address by which to identify

 

 

 

the remote IPSec router. Use up to 31 ASCII characters including spaces,

 

 

 

although trailing spaces are truncated. The domain name or e-mail address is for

 

 

 

identification purposes only and can be any string.

 

 

 

It is recommended that you type an IP address other than 0.0.0.0 or use the DNS

 

 

 

or E-mailID type in the following situations:

 

 

 

When there is a NAT router between the two IPSec routers.

 

 

 

When you want the Prestige to distinguish between VPN connection requests

 

 

 

that come in from remote IPSec routers with dynamic WAN IP addresses.

 

 

Encapsulation

Select Tunnel mode or Transport mode from the drop-down list box.

 

 

Mode

 

 

 

IPSec 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 next).

 

 

 

Select AH if you want to use AH (Authentication Header Protocol). The AH

 

 

 

protocol (RFC 2402) was designed for integrity, authentication, sequence

 

 

 

integrity (replay resistance), and non-repudiation but not for confidentiality, for

 

 

 

which the ESP was designed. If you select AH here, you must select options

 

 

 

from the Authentication Algorithm field (described later).

 

 

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 DES or 3DES from the drop-down list box. The Prestige’s encryption

 

 

Algorithm

algorithm should be identical to the secure remote gateway. When DES is used

 

 

 

for data communications, both sender and receiver must know the same secret

 

 

 

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

 

Chapter 15 VPN Screens

166