Traffic between the private addresses of Amazon EC2 instances in the same availability zone is free, but traffic from one Amazon EC2 instance to the public address of another instance is billable.
在同一个可用性区域中amazonEC2实例私有地址之间的通信是免费的，但是从一个amazon EC2实例到另一个实例的公共地址的通信是要付费的。
Traffic between the private addresses of Amazon EC2 instances in the same availability zone is free, but traffic from one Amazon EC2 instance to the public address of another instance is billable.
在同一个可用性区域中amazonEC2实例私有地址之间的通信是免费的，但是从一个amazon EC2实例到另一个实例的公共地址的通信是要付费的。
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