Which are reasonable solutions for enabling Internet access to an ECS instance without a public IP?

Binding an Elastic IP (EIP) to the ECS instance is a reasonable solution for enabling Internet access without assigning a public IP directly. An Elastic IP is a static public IP address that you can allocate to your Alibaba Cloud account and then associate with your ECS instance. This allows the instance to communicate with external networks while providing the flexibility of managing the IP independently.

Using an Elastic IP does not only facilitate seamless Internet access but also maintains the same IP address across instance stops and starts, making it easier for services that require a consistent endpoint. This is crucial for scenarios where you need to ensure reliable connectivity without the complications of dynamically assigned public IPs.

Furthermore, Elastic IPs enable you to manage the network traffic more efficiently and can provide additional benefits, such as better availability and failover strategies if necessary. By using Elastic IPs, you can enhance the security posture of your infrastructure while ensuring your ECS instances have necessary connectivity to the Internet.