D-Link DI-804V - Manual (Page 16)

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Incoming SPI
Enter the Incoming SPI that the remote VPN Gateway will use to identify this
SA.
Outgoing SPI
Enter the Outgoing SPI that the local VPN Gateway will use identify this SA
Encryption Protocol
VPN Internet Gateway supports three encryption algorithms (Null, DES, or
3DES); user can select an appropriate encryption algorithm.
Encryption Key
This string is used as a key to encrypt and decrypt the data transmitted.
Authentication Protocol
VPN Internet Gateway supports two authentication algorithms (MD5 or
SHA-1); user can select an appropriate authentication algorithm.
Authentication Key
This string is used as key authentication.