ZyXEL Vantage CNM User Guide - Page 332

Chapter 11 IPSec VPN Note: Only use manual key as a temporary solution, because it is not as secure as a regular IPSec SA. Figure 146 Device Operation > Device Configuration > VPN > IPSec VPN > VPN Connection > Add/Edit (Manual Key) This table describes labels specific to manual key configuration. See Section 11.1 on page 323 for descriptions of the other fields. Table 131 Device Operation > Device Configuration > VPN > IPSec VPN > VPN Connection > Add/Edit (Manual Key) LABEL DESCRIPTION Manual Key SPI Type a unique SPI (Security Parameter Index) between 256 and 4095. The SPI is used to identify the ZyWALL during authentication. Encapsulation Mode The ZyWALL and remote IPSec router must use the same SPI. 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. Active Protocol 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. 332 Vantage CNM User's Guide