Define IKE Crypto Profiles

The IKE crypto profile is used to set up the encryption and authentication algorithms used for the key exchange process in IKE Phase 1, and lifetime of the keys, which specifies how long the keys are valid. To invoke the profile, you must attach it to the IKE Gateway configuration.
All IKE gateways configured on the same interface or local IP address must use the same crypto profile.
  1. Create a new IKE profile.
    1. Select NetworkNetwork ProfilesIKE Crypto and select Add.
    2. Enter a Name for the new profile.
  2. Specify the DH (Diffie–Hellman) Group for key exchange and the Authentication and Encryption algorithms.
    Click Add in the corresponding sections (DH Group, Authentication, and Encryption) and select from the drop-downs.
    If you are not certain of what the VPN peers support, add multiple groups or algorithms in the order of most-to-least secure as follows; the peers negotiate the strongest supported group or algorithm to establish the tunnel:
    • DH Group—group20, group19, group14, group5, group2, and group1.
    • Authentication—sha512, sha384, sha256, sha1, md5.
    • Encryption—aes-256-cbc, aes-192-cbc, aes-128-cbc, 3des, des.
    As a best practice, choose the strongest authentication and encryption algorithms the peer can support. For the authentication algorithm, use SHA-256 or higher (SHA-384 or higher preferred for long-lived transactions). Do not use SHA-1 or MD5. For the encryption algorithm, use AES; DES and 3DES are weak and vulnerable.
  3. Specify the duration for which the key is valid and the re-authentication interval.
    1. In the Key Lifetime fields, specify the period (in seconds, minutes, hours, or days) for which the key is valid (range is 3 minutes to 365 days; default is 8 hours). When the key expires, the firewall renegotiates a new key. A lifetime is the period between each renegotiation.
    2. For the 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 default value of 0 disables the re-authentication feature.
  4. Commit your IKE Crypto profile.
    Click OK and click Commit.
  5. Attach the IKE Crypto profile to the IKE Gateway configuration.

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