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Using Openswan to Configure On- and Off-Cloud Communication_Virtual Private Network_Administrator Guide_Classic VPN_Huawei Cloud
GitHub - rdratlos/racoon-ipsec-tools: IPsec implementaion for Debian/Ubuntu originally developed by KAME project and widely used by Apple and NetBSD
![linux - Configure ipsec vpn tunnel (network to network with IKE with preshared key) on Centos 6 with openswan - Server Fault linux - Configure ipsec vpn tunnel (network to network with IKE with preshared key) on Centos 6 with openswan - Server Fault](https://i.stack.imgur.com/NydT1.jpg)