Other options
The following options will become available on this page depending on what has been configured previously:
∙The next IP address on the interface the tunnel is to go on field is the next gateway IP address or nexthop along the previously selected IPSec interface. This field will become available if an interface other than the default gateway was selected for the tunnel to go out on.
∙SPI Number field is the Security Parameters Index. It is a hexadecimal value and must be unique. It is used to establish and uniquely identify the tunnel. The SPI is used to determine which key is used to encrypt and decrypt the packets. It must be of the form 0xhex, where hex is one or more hexadecimal digits and be in the range of
∙Authentication Key field is the ESP Authentication Key. It must be of the form
0xhex, where hex is one or more hexadecimal digits. The hex part must be exactly 32 characters long when using MD5 or 40 characters long when using SHA1 (excluding any underscore characters). This field appears when Manual Keying has been selected.
∙Encryption Key field is the ESP Encryption Key. It must be of the form 0xhex, where hex is one or more hexadecimal digits. The hex part must be exactly 16 characters long when using DES or 48 characters long when using 3DES (excluding any underscore characters). This field appears when Manual Keying has been selected.
∙Cipher and Hash pull down menu contains the ESP encryption/authentication algorithms that can be used for the tunnel. The option selected must correspond to the encryption and authentication keys used. This pull down menu appears when Manual Keying has been selected. The options include the following:
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