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ESP Authentication
Algorithm
Inbound ESP
Authentication Key
Outbound ESP
Authentication Key
Inbound SPI (Hex)
Outbound SPI
(Hex)
The Inbound and Outbound SPI settings are required to be interpolated to function correctly. For
example:
AP1 Inbound SPI = 800
●
AP1 Outbound SPI = 801
●
AP2 Inbound SPI = 801
●
AP2 Outbound SPI = 800
●
4 Click Ok to return to the VPN screen. Click Apply to retain the settings made on the Manual Key
Settings screen.
5 Click Cancel to return to the VPN screen without retaining the changes made to the Manual Key
Settings screen.
Configuring Auto Key Settings
The access point's Network Management System can automatically set encryption and authentication
keys for VPN access. Use the Auto Key Settings screen to specify the type of encryption and
authentication, without specifying the keys. To manually specify keys, cancel out of the Auto Key
Settings screen, select the Manual Key Exchange radio button, and set the keys within the Manual Key
Setting screen.
Altitude 4700 Series Access Point Product Reference Guide
Select the authentication algorithm to use with ESP. This
option is available only when ESP with Authentication was
selected for the ESP type. Options include:
• MD5—Enables the Message Digest 5 algorithm, which
requires 128-bit (32-character hexadecimal) keys.
• SHA1—Enables Secure Hash Algorithm 1, which
requires 160-bit (40-character hexadecimal) keys.
Define a key for computing the integrity check on the
inbound traffic with the selected authentication algorithm.
The key must be 32/40 (for MD5/SHA1) hexadecimal (0-9,
A-F) characters in length. The key must match the
corresponding outbound key on the remote security
gateway.
Enter a key for computing the integrity check on outbound
traffic with the selected authentication algorithm. The key
must be 32/40 (for MD5/SHA1) hexadecimal (0-9, A-F)
characters in length. The key must match the
corresponding inbound key on the remote security
gateway.
Define an (up to) six-character (maximum) hexadecimal
value to identify the inbound security association created
by the encryption algorithm. The value must match the
corresponding outbound SPI value configured on the
remote security gateway.
Enter an (up to) six-character (maximum) hexadecimal
value to identify the outbound security association created
by the encryption algorithm. The value must match the
corresponding inbound SPI value configured on the remote
security gateway.
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