ZyXEL Communications Prestige 792H User Manual page 193

LABEL
My IP Address
Secure Gateway
Address
Security Protocol
IPSec Protocol Select ESP if you want to use ESP (Encapsulation Security Payload). The ESP
Encryption Algorithm Select DES, 3DES or NULL from the drop-down list box.
Encapsulation Key
(only with ESP)
Authentication
Algorithm
Authentication Key Type a unique authentication key to be used by IPSec if applicable. Enter 16
Back
VPN Screens
Table 14-9 VPN Manual Key
Enter the WAN IP address of your Prestige. The Prestige uses its current WAN IP
address (static or dynamic) in setting up the VPN tunnel if you leave this field as
0.0.0.0. The VPN tunnel has to be rebuilt if this IP address changes.
Type the WAN IP address or the URL (up to 31 characters) of the IPSec router 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 Key Mode field must be set to
IKE).
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 Authentication
Algorithm field (described later).
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 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. Select NULL to set up a
tunnel without encryption. When you select NULL, you do not enter an encryption
key.
With DES, type a unique key 8 characters long. With 3DES, type a unique key 24
characters long. Any characters may be used, including spaces, but trailing spaces
are truncated.
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 SHA-1 for maximum security.
characters for MD5 authentication or 20 characters for SHA-1 authentication. Any
characters may be used, including spaces, but trailing spaces are truncated.
Click Back to return to the previous screen.
Prestige 792H User's Guide
DESCRIPTION
14-23