See Elastic IP
An elastic IP address (EIP) can be bound to any ECSs in your account rather than a specified ECS. Different from a static IP address, when an ECS or its AZ is unavailable, its EIP can quickly redirect to the Internet IP address of any ECS in your account.
A remote gateway is the public IP address of the physical device on the peer end in an IPsec VPN tunnel. The remote gateway of each IPsec VPN tunnel must be unique.
A remote subnet is the destination IP addresses reachable through the tunnel. All IP packets destined for this subnet are sent along the IPsec VPN tunnel. Multiple remote subnets can be configured. However, the remote subnet cannot conflict with the subnet of the VPC where the VPN resides.
A route table contains a set of rules that are used to determine where network traffic is directed. You can add routes to a route table to enable other ECSs in a VPC to access the Internet through the ECS that has a bound EIP.
A Virtual Private Cloud (VPC) is a secure, isolated, and logical network environment. You can create virtual networks in a VPC. The virtual networks provide the same network functions as those provided by a physical network, as well as providing advanced network services, such as elastic IP addresses and security groups.
The virtual private network (VPN) service establishes an encrypted communication tunnel between a remote user and a VPC, thereby enabling the remote user to use service resources in the VPC.
A VPC peering connection is a networking connection between two VPCs that enables you to route traffic between them using private IP addresses. ECSs in either VPC can communicate with each other just as if they were in the same VPC. You can create a VPC peering connection between your own VPCs, or between your VPC and another tenant's VPC within the same region.
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