The IPsec VPN protocol is the industry-standard VPN protocol and allows you to create site-to-site VPN tunnels to third-party VPN gateways. The firewall supports both IKEv1 and IKEv2 site-to-site tunnels. To improve connectivity with third-party IPsec implementations, Barracuda Networks is part of the Virtual Private Network Consortium (vpnc.org). There, you can find IKEv1 IPsec profiles tested specifically for interoperability.
IKEv1 VPN Tunnels
IPsec IKEv1 Site-to-Site VPN Tunnel Configuration
The firewall can establish IPsec VPN tunnels to any standard compliant third-party IKEv1 IPsec VPN gateway. The site-to-site IPsec VPN tunnel must be configured with identical settings on both the CloudGen Firewall and the third-party IPsec gateway.
For more information, see How to Configure a Site-to-Site IPsec IKEv1 VPN Tunnel.
IPsec Site-to-Site VPN Tunnel to Azure VPN Gateway
You can connect to the Azure VPN gateway using a statically routed configuration using IKEv1 to use the static Azure VPN gateway mode.
For more information, see How to Configure an IPsec site-to-site VPN to a Microsoft Azure VPN Gateway.