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Step Command
Remarks
3.
Specify an encryption
algorithm for the IKE
proposal.
•
In non-FIPS mode:
encryption-algorithm
{
3des-cbc
|
aes-cbc-128
|
aes-cbc-192
|
aes-cbc-256
|
des-cbc
}
•
In FIPS mode:
encryption-algorithm
{
aes-cbc-128
|
aes-cbc-192
|
aes-cbc-256
}
By default:
•
In non-FIPS mode, an IKE
proposal uses the 56-bit DES
encryption algorithm in CBC
mode.
•
In FIPS mode, an IKE
proposal uses the 128-bit AES
encryption algorithm in CBC
mode.
4.
Specify an authentication
method for the IKE proposal.
authentication-method
{
dsa-signature
|
pre-share
|
rsa-signature
}
By default, an IKE proposal uses
the pre-shared key authentication
method.
5.
Specify an authentication
algorithm for the IKE
proposal.
•
In non-FIPS mode:
authentication-algorithm
{
md5
|
sha
|
sha256
|
sha384
|
sha512
}
•
In FIPS mode:
authentication-algorithm
{
sha
|
sha256
|
sha384
|
sha512
}
By default, an IKE proposal uses
the HMAC-SHA1 authentication
algorithm in non-FIPS mode and
the HMAC-SHA256
authentication algorithm in FIPS
mode.
6.
Specify a DH group for key
negotiation in phase 1.
•
In non-FIPS mode:
dh
{
group1
|
group14
|
group2
|
group24
|
group5
}
•
In FIPS mode:
dh group14
By default:
•
In non-FIPS mode, DH group1
(the 768-bit DH group) is
used.
•
In FIPS mode, DH group14
(the 2048-bit DH group) is
used.
7.
Set the IKE SA lifetime for
the IKE proposal.
sa
duration
seconds
By default, the IKE SA lifetime is
86400 seconds.
Configuring an IKE keychain
Perform this task when you configure the IKE to use the pre-shared key for authentication.
Follow these guidelines when you configure an IKE keychain:
1.
Two peers must be configured with the same pre-shared key to pass pre-shared key authentication.
2.
You can specify the local address configured in IPsec policy or IPsec policy template view (using
the
local-address
command) for the IKE keychain to be applied. If no local address is configured,
specify the IP address of the interface that references the IPsec policy.
3.
You can specify a priority number for the IKE keychain. To determine the priority of an IKE
keychain:
a.
The device examines the existence of the
match local address
command. An IKE keychain with
the
match local address
command configured has a higher priority.
b.
If a tie exists, the device compares the priority numbers. An IKE keychain with a smaller priority
number has a higher priority.
c.
If a tie still exists, the device prefers an IKE keychain configured earlier.
To configure the IKE keychain:
