Define IPSec Crypto Profiles

The IPSec crypto profile is invoked in IKE Phase 2. It specifies how the data is secured within the tunnel when Auto Key IKE is used to automatically generate keys for the IKE SAs.
  1. Create a new IPSec profile.
    1. Select NetworkNetwork ProfilesIPSec Crypto and select Add.
    2. Enter a Name for the new profile.
    3. Select the IPSec Protocol—ESP or AH—that you want to apply to secure the data as it traverses across the tunnel.
      As a best practice, select ESP (Encapsulating Security payload) over AH (Authentication Header) because ESP offers both confidentiality and authentication for the connection whereas AH offers only authentication.
    4. Click Add and select the Authentication and Encryption algorithms for ESP, and Authentication algorithms for AH, so that the IKE peers can negotiate the keys for the secure transfer of data across the tunnel.
      If you are not certain of what the IKE peers support, add multiple algorithms in the order of most-to-least secure as follows; the peers negotiate the strongest supported algorithm to establish the tunnel:
      • Encryption—aes-256-gcm, aes-256-cbc, aes-192-cbc, aes-128-gcm, aes-128-ccm (the VM-Series firewall doesn’t support this option), 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-512, SHA-1, or MD5. For the encryption algorithm, use AES; DES and 3DES are weak and vulnerable.
      • Authentication—sha512, sha384, sha256, sha1, md5.
  2. Select the DH Group to use for the IPSec SA negotiations in IKE phase 2.
    Select the key strength that you want to use from the DH Group drop-down.
    If you are not certain of what the VPN peers support, add multiple groups in the order of most-to-least secure as follows; the peers negotiate the strongest supported group to establish the tunnel: group20, group19, group14, group5, group2, and group1.
    Select no-pfs if you do not want to renew the key that was created at phase 1; the current key is reused for the IPSEC SA negotiations.
  3. Specify the duration of the key—time and volume of traffic.
    Using a combination of time and traffic volume allows you to ensure safety of data.
    Select the Lifetime or time period for which the key is valid in seconds, minutes, hours, or days (range is 3 minutes to 365 days). When the specified time expires, the firewall will renegotiate a new set of keys.
    Select the Lifesize or volume of data after which the keys must be renegotiated.
  4. Commit your IPSec profile.
    Click OK and click Commit.
  5. Attach the IPSec Profile to an IPSec tunnel configuration.

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