Define IKE Crypto Profiles

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 menus.

   If you are not certain what the VPN peers support, add multiple groups or algorithms in the order of most-to-least secure; the peers negotiate the strongest supported group or algorithm to establish the tunnel.

   • DH Group—
     • group20
     • group19
     • group14
     • group5
     • group2
     • group1
   • Authentication—
     • sha512
     • sha384
     • sha256
     • sha1
     • md5
     • (PAN-OS 10.0.3 and later 10.0 releases) none
     If you select an AES-GCM algorithm for encryption, you must select the Authentication setting none or the commit will fail. The hash is automatically selected based on the DH Group selected. DH Group 19 and below uses sha256; DH Group 20 uses sha384.
   • Encryption—
     • (PAN-OS 10.0.3 and later 10.0 releases) aes-256-gcm (requires IKEv2; DH Group should be set to group20)
     • (PAN-OS 10.0.3 and later 10.0 releases) aes-128-gcm (requires IKEv2 and DH Group set to group19)
     • aes-256-cbc
     • aes-192-cbc
     • aes-128-cbc
     • 3des
     • des

   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. AES with Galois/Counter Mode (AES-GCM) provides the strongest security and has built-in authentication, so you must set Authentication to none if you select aes-256-gcm or aes-128-gcm encryption.
3. Specify the duration for which the key is valid and the re-authentication interval.
   For details, see SA Key Lifetime and 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.
   See Configure advanced options for the gateway.