I've been working on troubleshooting an EC2 instance accessing an S3 bucket, and I can reach the bucket, but it looks like my traffic is going through the public internet rather than the intended VPC endpoint. I've confirmed that there's an S3 endpoint set up and that my EC2's subnet has the right route to this VPC endpoint. I also checked the bucket policy and ran some commands to see the IP addresses I'm getting. When I ran `dig s3.amazonaws.com`, I still got public IPs instead of the internal ones I expected. One thing I noticed is that the 'Private DNS names enabled' option for the VPC endpoint is set to 'No.' I'm unsure if I'm missing some configuration or if I need to adjust how I'm referencing the S3 bucket. Any insights would be greatly appreciated!
3 Answers
Did you confirm that the subnet route table is associated with the VPC endpoint? That could definitely lead to issues with traffic routing. Also, if the EC2 instance using a NAT gateway is causing problems, you might want to look into that configuration to ensure it doesn't interfere with traffic to S3.
If you have an S3 gateway endpoint, it should route traffic without exposing it to the public internet. Even though the DNS resolves to public IPs, the traffic should still be private. Double-check your subnet's route table for an entry pointing towards the S3 prefix list for confirmation. If you want to be really sure, you could temporarily revoke other internet access to see if everything still works. However, just using PrivateLink could simplify things for you and avoid any routing confusion!
What region are you working in? It might help to run `dig` with the S3 URL tailored for your region. Sometimes settings in the OS can interfere too, so make sure the URLs are set correctly in your no-proxy settings if those are defined.
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