Often times when running on AWS you will have multiple AZs, accounts and VPCs. This is a simple summary of EC2 data transfer costs:
1. Within the same AZ : Free: It is within the same AZ and over private IP.
2. Between two AZs : Cost. Will incur inter-az charges for both inbound and outbound
1. Within the same AZ : Free: It is within the same AZ and over private IP.
2. Between two AZs : Cost. Will incur inter-az charges for both inbound and outbound
3. Between Accounts in different VPCs : Cost. Inter-az charges are applicable for data transfer charges between instances in the different AZ's (same region) and in different accounts.
4. Between one EC2 classic instance and VPC EC2 instance in a same AZ : Cost
5. Instances to S3 in the same region: Free
6. Instance to S3 in different region: Cost. cross region charges
4. Between one EC2 classic instance and VPC EC2 instance in a same AZ : Cost
5. Instances to S3 in the same region: Free
6. Instance to S3 in different region: Cost. cross region charges
and Between one ec2 classic and vpc instance in a same AZ
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