Network > Network Profiles > IKE Crypto

Use the
IKE Crypto Profiles
page to specify protocols and algorithms for identification, authentication, and encryption (IKEv1 or IKEv2, Phase 1).
To change the order in which an algorithm or group is listed, select the item and then click
Move Up
or
Move Down
. The order determines the first choice when settings are negotiated with a remote peer. The setting at the top of the list is attempted first, continuing down the list until an attempt is successful.
IKE Crypto Profile Settings
Description
Name
Enter a name for the profile.
DH Group
Specify the priority for Diffie-Hellman (DH) groups. Click
Add
and select groups:
group1
,
group2
,
group5
,
group14
,
group19
, or
group20
. For highest security, select an item and then click
Move Up
or
Move Down
to move the groups with higher numeric identifiers to the top of the list. For example, move
group14
above
group2
.
Authentication
Specify the priority for hash algorithms. Click
Add
and select algorithms. For highest security, select an item and then click
Move Up
or
Move Down
to change the order (top to bottom) to the following:
  • sha512
  • sha384
  • sha256
  • sha1
  • md5
  • none
If you select an AES-GCM algorithm for encryption, you must select the Authentication setting
none
. The hash is automatically selected based on the DH Group selected. DH Group 19 and below uses
sha256
; DH Group 20 uses
sha384
.
Encryption
Select the appropriate Encapsulating Security Payload (ESP) authentication options. Click
Add
and select algorithms. For highest security, select an item and then click
Move Up
or
Move Down
to change the order (top to bottom) to the following:
  • aes-256-gcm
    (requires IKEv2; DH Group should be set to
    group20
    )
  • aes-128-gcm
    (requires IKEv2 and DH Group set to
    group19
    )
  • aes-256-cbc
  • aes-192-cbc
  • aes-128-cbc
  • 3des
  • des
The
aes-256-gcm
and
aes-128-gcm
algorithms have authentication built into them; therefore, in those cases you must select the
Authentication
setting to be
none
.
Key Lifetime
Select unit of time and enter the length of time that the negotiated IKE Phase 1 key will be effective (default is 8 hours).
  • IKEv2—Before the key lifetime expires, the SA must be re-keyed or else, upon expiration, the SA must begin a new Phase 1 key negotiation.
  • IKEv1—Will not actively do a Phase-1 re-key before expiration. Only when the IKEv1 IPSec SA expires will it trigger IKEv1 Phase 1 re-key.
IKEv2 Authentication Multiple
Specify a value (range is 0-50; default is 0) that is multiplied by the Key Lifetime to determine the authentication count. The authentication count is the number of times that the gateway can perform IKEv2 IKE SA re-key before the gateway must start over with IKEv2 re-authentication. A value of 0 disables the re-authentication feature.

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