Network > Network Profiles > IPSec Crypto

Select NetworkNetwork ProfilesIPSec Crypto to configure IPSec Crypto profiles that specify protocols and algorithms for authentication and encryption in VPN tunnels based on IPSec SA negotiation (Phase 2).
For VPN tunnels between GlobalProtect gateways and clients, see Network > Network Profiles > GlobalProtect IPSec Crypto.
IPSec Crypto Profile Settings
Enter a Name to identify the profile (up to 31 characters). The name is case-sensitive and must be unique. Use only letters, numbers, spaces, hyphens, and underscores.
IPSec Protocol
Select a protocol for securing data that traverses the VPN tunnel:
  • ESP—Encapsulating Security Payload protocol encrypts the data, authenticates the source, and verifies data integrity.
  • AH—Authentication Header protocol authenticates the source and verifies data integrity.
Use ESP protocol because it provides connection confidentiality (encryption) as well as authentication.
Encryption (ESP protocol only)
Click Add and select the desired encryption algorithms. For highest security, use Move Up and Move Down to change the order (top to bottom) to the following: 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, and des. You can also select null (no encryption).
Use a form of AES encryption. (DES and 3DES are weak, vulnerable algorithms.)
Click Add and select the desired authentication algorithms. For highest security, use Move Up and Move Down to change the order (top to bottom) to the following: sha512, sha384, sha256, sha1, md5. If the IPSec Protocol is ESP, you can also select none (no authentication).
Use sha256 or stronger authentication because md5 and sha1 are not secure. Use sha256 for short-lived sessions and sha384 or higher for traffic that requires the most secure authentication, such as financial transactions.
DH Group
Select the Diffie-Hellman (DH) group for Internet Key Exchange (IKE): 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.
Select units and enter the length of time (default is one hour) that the negotiated key will stay effective.
Select optional units and enter the amount of data that the key can use for encryption.

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