Networking Costs

Links: 101 AWS SAA Index

Networking Costs¶

Inbound traffic (ingress) from outside to AWS is free.

Always use private IP over public IP for cost savings and better network performance.
- In case of inter AZ transfer if you are using private IP then it costs you less than public IP.
- If EC2 instances are within the same AZ and are using private IP to communicate then there will be no traffic charges.
- Use same AZ for maximum cost savings at the cost of HA (High Availability).
Diagram:

Outbound traffic (egress) from AWS to outside is charged.

Try to keep as much internet traffic within AWS to minimise costs
Direct Connect location that are co-located in the same AWS Region result in lower cost for egress network.

S3 ingress: free
S3 to Internet: $0.09 per GB
S3 Transfer Acceleration:
- Faster transfer times (50 to 500% better)
- Additional cost on top of Data Transfer Pricing: +$0.04 to $0.08 per GB
S3 to CloudFront: $0.00 per GB
CloudFront to Internet: $0.085 per GB (slightly cheaper than S3)
- Caching capability (lower latency)
- Reduce costs associated with S3 Requests Pricing (7x cheaper with CloudFront)
S3 Cross Region Replication: $0.02 per GB
Diagram:

Examples on how to avoid egress charges
- Use an Amazon EC2 instance in the same Region as the S3 bucket
- Use lambda@edge for compressing data before sending to users.
Always use VPC Endpoints over NAT Gateway

Last updated: 2023-03-09