Definition of SNAT

Besides requiring services provided by the system, some ECSs also need to access the Internet to obtain information or download software. The system allows users to bind EIPs to virtual NICs (ports) of ECSs to enable the ECSs to access the Internet. However, assigning a public IP address to each ECS consume scarce resources (such as IPv4 addresses), incur additional costs, and probably increase the possibility of attacks on a virtual environment. Therefore, enabling multiple ECSs to share one public IP address is feasible. Specifically, this can be realized using SNAT.

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