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    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
    • non-auth
    If you select an AES-GCM algorithm for encryption, you must select the Authentication setting non-auth. 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 non-auth.
    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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