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
      Network
      Network Profiles
      IPSec 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-1, MD5 or none. 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.
    From
    DH Group
    , select the key strength you want to use:
    group1
    ,
    group2
    ,
    group5
    ,
    group14
    ,
    group19
    , or
    group20
    . For highest security, choose the group with the highest number.
    If you don’t want to renew the key that the firewall creates during IKE phase 1, select
    no-pfs
    (no perfect forward secrecy); the firewall reuses the current key for the IPSec security association (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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