云上 VPN

[如何在AWS上构建基于 OpenSwan 的软件 VPN 解决方案]

https://www.awsok.com/%E5%A6%82%E4%BD%95%E5%9C%A8aws%E4%B8%8A%E6%9E%84%E5%BB%BA%E5%9F%BA%E4%BA%8E-openswan-%E7%9A%84%E8%BD%AF%E4%BB%B6-vpn-%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88-2/

[在 AWS 上使用 OpenVPN 搭建自定义端口的 Site-to-Site VPN]

https://aws.amazon.com/cn/blogs/china/setup-site-to-site-vpn-with-openvpn/