Group 1, Group 2 (default), Group 5, or Group 14 – Select Group 2 from the DH Group drop-down menu. NOTE: The Windows XP L2TP client only works with DH Group 2. Select DES , 3DES (default), AES-128 , AES-192 , or AES-256 from the Encryption drop-down menu.
Key exchange (DH) Groups Supported - Site to Site VPN. 03/26/2020 18 9546. DESCRIPTION: Diffie-Hellman key exchange, also called exponential key exchange, is an asymmetric key algorithm used for public key cryptography. A protocol for creating a shared secret between two sides of a communication, whether IKE, TLS, SSH and some others. DH Group 20: 384-bit elliptic curve group Both peers in a VPN exchange must use the same DH group, which is negotiated during Phase 1 of the IPSec negotiation process. When you define a manual BOVPN tunnel, you specify the Diffie-Hellman group as part of Phase creation of an IPSec connection. Jan 07, 2020 · There has been a lot around Diffie-Hellman groups and which ones to use. Some think that the bigger the DH group number is, the bigger the key length. What is Diffie-Hellman The Diffie-Hellman algorithm was created to address the issue of secure encrypted keys from being attacked over the internet when in transmission, though using the Diffie-Hellman algorithm in distributing symmetric keys CLI Statement. SRX Series,vSRX. Specify the IKE Diffie-Hellman group. The device does not delete existing IPsec SAs when you update the dh-group configuration in the IKE proposal. DH with 1536 bits (group 5) has 89 bits of security DH with 2048 bits (group 14) has 103 bits of security That is: If a really secure VPN connection is needed, the phase 1 and phase 2 parameters should use at least Diffie-Hellman group 14 to gain 103 bits of security.
Similar to my test with Diffie-Hellman group 14 shown here I tested a VPN connection with elliptic curve Diffie-Hellman groups 19 and 20. The considerations why to use these DH groups are listed in the just mentioned post – mainly because of the higher security level they offer.
Here are differences among Group 1, 2 and 5. Group 5 uses the highest bit DH, and is supposed to be more secure than the others. Group 1: 768-bit Diffie-Hellman prime modulus Group 2: 1024-bit Diffie-Hellman prime modulus Group 5: 1536-bit Diffie-Hellman prime modulus Verify PFS is being used Similar to my test with Diffie-Hellman group 14 shown here I tested a VPN connection with elliptic curve Diffie-Hellman groups 19 and 20. The considerations why to use these DH groups are listed in the just mentioned post – mainly because of the higher security level they offer. set vpn ipsec ike-group FOO0 proposal 1 dh-group 14 set vpn ipsec ike-group FOO0 proposal 1 encryption aes128 set vpn ipsec ike-group FOO0 proposal 1 hash sha1. 4. Create the ESP / Phase 2 (P2) SAs and enable Perfect Forward Secrecy (PFS). set vpn ipsec esp-group FOO0 lifetime 3600 set vpn ipsec esp-group FOO0 pfs enable set vpn ipsec esp-group
Our customer is using a Cisco 5500 Series ASA appliance to connect to the AWS VPN service. The FAQ provided my AWS describes that the following Diffie-Hellman Groups are supported for Phase 1 and Phase 2: Q. Which Diffie-Hellman Groups do you support? We support the following Diffie-Hellman (DH) groups in Phase1 and Phase2.
Jun 26, 2020 · Cloud VPN's proposal presents these key exchange algorithms in the order shown. Cloud VPN accepts any proposal that contains one or more of these algorithms, in any order. Diffie-Hellman (DH) Refer to Phase 1. If your VPN gateway requires DH settings for Phase 2, use the same settings that you used for Phase 1. Phase 2 lifetime