In a nutshell then, let’s define these values just for the purpose of this guide: On your end, you should supply to your customer your VPN Gateway and your encryption domain (the private network that you are going to use to access it) Customer Encryption Domain: This is the private network that you should access (it can be more than one).Customer VPN Gateway: This is the public IP of the other end of the tunnel.Let’s verify if everything is fine: # ipsec verifyĪ normal configuration will look like this: Gathering information and setting up the configurationīefore you start configuring the vpn connection, you will need some information to proceed: I imagine you have an instance, lets say on Google Cloud, and want to establish an IPSec tunnel with another client outside your infrastructure.įollow this tutorial in order to learn how to easily achieve it! Installing OpenSwan and its dependencies # apt-get install openswan ipsec-tools
The digest function is integral to the GCM cipher.This is a brief tutorial that aims to help those who are new in setting up an IPsec VPN connection with OpenSwan, hosted in cloud environments like Google Cloud and Amazon Web Services. If you specify a GCM-based cipher for IKE Encryption, set IKE Digest Algorithm to None. Phase 2 (IPsec Profile) IPsec VPN SettingsĬonfigurable settings are the same for Phase 1 and Phase 2. You must use IKE V2 if you use a GCM-based cipher The digest function is integral to the GCM cipher.
Configurable Settings AttributeĮncryption with higher bit depths is harder to crack but creates more load on your endpoint device. Phase 1 (IKE Profile) IPsec VPN Settings Table 1. Note: DH Groups 2 and 5 are not NIST-approved, and should be used only when required for compatibility with an older on-premises device.Īs a best practice, configurable settings should be the same for both phases.
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