ZyXEL Communications Prestige 662H Series User Manual page 239

Prestige 662H/HW Series User's Guide
Table 74 VPN: Manual Key (continued)
LABEL
End / Subnet Mask When the Remote Address Type field is configured to Single, this field is N/A.
Address
Information
My IP Address
Secure Gateway
Address
Security Protocol
IPSec Protocol
Encryption
Algorithm
Encapsulation Key
(only with ESP)
Authentication
Algorithm
Authentication Key
Back
Apply
Cancel
Delete
239
DESCRIPTION
When the Remote Address Type field is configured to Range, enter the end
(static) IP address, in a range of computers on the network behind the remote
IPSec router. When the Remote Address Type field is configured to Subnet,
enter a subnet mask on the network behind the remote IPSec router.
Enter the WAN IP address of your Prestige. The VPN tunnel has to be rebuilt if
this IP address changes.
The following applies if this field is configured as 0.0.0.0:
The Prestige uses the current Prestige WAN IP address (static or dynamic) to set
up the VPN tunnel.
If the WAN connection goes down, the Prestige uses the dial backup IP address
for the VPN tunnel when using dial backup or the LAN IP address when using
traffic redirect. See the chapter on WAN for details on dial backup and traffic
redirect.
Type the WAN IP address or the URL (up to 31 characters) of the IPSec router
with which you're making the VPN connection.
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 DES, 3DES or NULL from the drop-down list box.
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.
Type a unique authentication key to be used by IPSec if applicable. Enter 16
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.
Click Apply to save your changes back to the Prestige.
Click Cancel to begin configuring this screen afresh.
Click Delete to remove the current rule.
Chapter 19 VPN Screens