ZyXEL Communications Vantage CNM 2.0 User Manual page 134

Vantage CNM 2.0
Table 11-7 Configuration > VPN > Tunnel IPSec Detail – Edit
LABEL
A-End / Z-End Select the name of the ZyXEL device from the pull-down list.
Device
My IP This is the IP address of the local and remote computer(s) of the VPN tunnel.
Peer IP Type the IP address of the computer with which you will make the VPN connection or
leave the field blank to have the ZyXEL device automatically use the address in the
Secure Gateway field.
Address Start When the Address Type field is configured to Single, enter a (static) IP address on the
LAN behind the ZyXEL device. When the Address Type field is configured to Range,
enter the beginning (static) IP address, in a range of computers on the LAN behind the
ZyXEL device. When the Address Type field is configured to Subnet, this is a (static) IP
address on the LAN behind the ZyXEL device.
Address End When the Address Type field is configured to Single, this field is N/A. When the Address
Type field is configured to Range, enter the end (static) IP address, in a range of
computers on the LAN behind the ZyXEL device. When the Address Type field is
configured to Subnet, this is a subnet mask on the LAN behind the ZyXEL device.
SPI Type a number (base 10) from 1 to 999999 for the Security Parameter Index.
Active 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.
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.
Encapsulation Select Tunnel mode or Transport mode from the drop-down list box.
Select DES, 3DES or NULL from the drop-down list box.
Encryption
Algorithm
When you use DES or 3DES, both sender and receiver must know the Encryption Key,
which can be used to encrypt and decrypt the messages. 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.
Authentication When you use SHA1 or MD5, both sender and receiver must know the Authentication
Key, which can be used to generate and verify a message authentication code. Select
Algorithm
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.
Encryption Key This field only applies when you select ESP. With DES, type a unique key 8 ASCII
characters long. With 3DES, type a unique key 24 ASCII characters long. Any characters
may be used, including spaces, but trailing spaces are truncated.
Authentication Key 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.
Apply Click Apply to save your changes back to the ZyXEL device.
Cancel Click Cancel to begin configuring this screen afresh.
11-14
DESCRIPTION
Configuration > VPN