https://help.aliyun.com/document_detail/87620.html
http://www.asznl.com/post/81
https://access.redhat.com/documentation/zh-cn/red_hat_enterprise_linux/8/html/configuring_and_managing_networking/configuring-ip-tunnels_configuring-and-managing-networking
专有网络VPC下ECS实例之间如何搭建IPIP隧道
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