Diffie-Helliman is a key exchange protocol and creates a secure channel by exchanging public key /master key.ġ2. DH Group- Must be identical with remote peer (DH-5). Authentication methods verify the identity of peer user which means traffic is coming from correct user and there is no man-in-middle attack.ġ1.

Authentication method – it must be identical with remote site. Encryption method provides end-to-end confidentiality to the VPN traffic.ġ0. Encryption Method, it must be identical with remote parties. Main mode is the suggested key-exchange method because it hides the identities of the peer sites during the key exchange.ĩ. Select IKE version to communicate over Phase I and Phase IIĨ. Enter Pre-shared Key, Pre-shared key is used to authenticate the integrity of both parties. Set address of remote gateway public Interface (10.30.1.20)Ħ. Name – Specify VPN Tunnel Name (Firewall-1)Ĥ. Select VPN Setup, set Template type Site to Siteģ. IPSec VPN Configuration Site-I Follow below steps to Create VPN Tunnel -> SITE-IĢ. IPsec parameters like encryption algorithm, authentication methods, Hash value, pre-shared keys must be identical to build a security association between two remote parties.įirewall -1, check internal interface IP addresses and External IP addresses Security Association are basis for building security functions into IPsec. IKE allows two remote parties involved in a transaction to set up Security Association. IKE uses port 500 and USP 4500 when crossing NAT device. IKE is used to authenticate both remote parties, exchange keys, negotiate the encryption and checksum that is used in VPN Tunnel. IPsec contains suits of protocols which includes IKE. IPsec supports Encryption, data Integrity, confidentiality. IPsec: It is a vendor neutral security protocol which is used to link two different networks over a secure tunnel.

Fortigate ipsec vpn