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set vpn
236 Chapter 2 Command Descriptions
inbound_enc_key={ascii key|hex key}
The encryption key for inbound traffic, according to the authentication
algorithm specified by the “inbound_encryption” option. The
encryption key may be specified as an ASCII value using alpha-
numeric characters or may be specified as a hexadecimal value
prefixed by “0x”. The following table lists the associated lengths of the
encryption keys based on the encryption algorithm.
outbound_spi=256 - 2^32
The SPI for outbound traffic.The SPI defines the unique index for a
tunnel used to identify the security settings for IPSec. The SPI is a 32-
bit unsigned value that must not be less than 256.
outbound_authentication={none|md5|sha1}
The optional authentication algorithm used with the associated
authentication key specified by the “outbound_auth_key” option to
authorize access on the VPN tunnel for outbound traffic.
none
No authentication algorithm is used.
md5
MD5 authentication algorithm, which uses 128-bit keys.
sha1
SHA1 authentication algorithm, which uses 160-bit keys.
outbound_auth_key={ascii key|hex key}
The authentication key for outbound traffic, according to the
authentication algorithm specified by the “outbound_authentication”
option. The authentication key may be specified as an ASCII value
using alpha-numeric characters or may be specified as a hexadecimal
value prefixed by “0x”. For the allowed lengths for this key, see
“inbound_auth_key.”
outbound_encryption={none|des|3des|aes}
The optional encryption algorithm used with the associated encryption
key specified by the “outbound_enc_key” option to encrypt data on the
VPN tunnel for outbound traffic. For the allowed values, see
“inbound_encryption.”
outbound_enc_key={ascii key|hex key}
The encryption key for outbound traffic, according to the authentication
algorithm specified by the “outbound_encryption” option. For the
allowed values and key length, see “inbound_enc_key.”
Algorithm Size
Key Length
ASCII Hexadecimal
DES 64-bit 8 16
3 DES 192-bit 24 48
AES 128-bit 16 32