ZyXEL Communications 200 Series User Manual page 362

Chapter 20 IPSec VPN
Table 117 VPN > IPSec VPN > VPN Connection > Manual Key > Edit (continued)
LABEL
Encapsulation
Mode
Active
Protocol
Encryption
Algorithm
Authentication
Algorithm
Encryption
Key
362
DESCRIPTION
Select which type of encapsulation the IPSec SA uses. Choices are
Tunnel - this mode encrypts the IP header information and the data
Transport - this mode only encrypts the data. You should only select this if the
IPSec SA is used for communication between the ZyWALL and remote IPSec
router.
If you select Transport mode, the ZyWALL automatically switches to Tunnel
mode if the IPSec SA is not used for communication between the ZyWALL and
remote IPSec router. In this case, the ZyWALL generates a log message for this
change.
The ZyWALL and remote IPSec router must use the same encapsulation.
Select which protocol you want to use in the IPSec SA. Choices are:
AH (RFC 2402) - provides integrity, authentication, sequence integrity (replay
resistance), and non-repudiation but not encryption. If you select AH, you must
select an Authentication Algorithm.
ESP (RFC 2406) - provides encryption and the same services offered by AH, but
its authentication is weaker. If you select ESP, you must select an Encryption
Algorithm and Authentication Algorithm.
The ZyWALL and remote IPSec router must use the same protocol.
This field is applicable when the Active Protocol is ESP. Select which key size
and encryption algorithm to use in the IPSec SA. Choices are:
NULL - no encryption key or algorithm
DES - a 56-bit key with the DES encryption algorithm
3DES - a 168-bit key with the DES encryption algorithm
AES128 - a 128-bit key with the AES encryption algorithm
AES192 - a 192-bit key with the AES encryption algorithm
AES256 - a 256-bit key with the AES encryption algorithm
The ZyWALL and the remote IPSec router must use the same algorithm and key.
Longer keys require more processing power, resulting in increased latency and
decreased throughput.
Select which hash algorithm to use to authenticate packet data in the IPSec SA.
Choices are SHA1 and MD5. SHA1 is generally considered stronger than MD5,
but it is also slower.
The ZyWALL and remote IPSec router must use the same algorithm.
This field is applicable when you select an Encryption Algorithm. Enter the
encryption key, which depends on the encryption algorithm.
DES - type a unique key 8-32 characters long
3DES - type a unique key 24-32 characters long
AES128 - type a unique key 16-32 characters long
AES192 - type a unique key 24-32 characters long
AES256 - type a unique key 32 characters long
You can use any alphanumeric characters or ,;|`~!@#$%^&*()_+\{}':./<>=-".
If you want to enter the key in hexadecimal, type "0x" at the beginning of the key.
For example, "0x0123456789ABCDEF" is in hexadecimal format; in
"0123456789ABCDEF" is in ASCII format. If you use hexadecimal, you must enter
twice as many characters as listed above.
The remote IPSec router must have the same encryption key.
The ZyWALL ignores any characters above the minimum number of characters
required by the algorithm. For example, if you enter
encryption key, the ZyWALL only uses
longer key.
1234567890XYZ
12345678 . The ZyWALL still stores the
ZyWALL USG 100/200 Series User's Guide
for a DES