Connectivity Problems from AWS

I understand you're experiencing connectivity issues from your AWS VPS instances in India to certain IP addresses, specifically those provided by OVH in India. This is a concerning situation, especially since you can reach these IPs without issues from other VPS providers and your home network. Let's explore some potential causes and troubleshooting steps:

1. Check your AWS VPC configuration:
- Ensure that your VPC's route tables are correctly configured to allow outbound traffic to the internet.
- Verify that your instances are in a subnet with a route to an Internet Gateway or NAT Gateway.

2. Review your security groups and network ACLs:
- Check that your security groups allow outbound traffic to the destination IP addresses.
- Verify that your network ACLs are not blocking the outbound traffic or the return traffic on ephemeral ports.

3. Examine VPC Network Firewall rules:
- If you're using AWS Network Firewall, ensure it's not blocking traffic to the OVH IP addresses.

4. Test connectivity:
- Use tools like ping or traceroute to identify where the packet loss is occurring in the network path.
- Try connecting to the IP addresses using different protocols (e.g., HTTP, HTTPS) to see if the issue is protocol-specific.

5. Check for AWS service health issues:
- Review the AWS Service Health Dashboard for any reported issues in the India region that might affect network connectivity.

6. Gather more data:
- Run MTR (My TraceRoute) tests from your AWS instances to the problematic IP addresses to get a more detailed view of where packet loss is occurring.
- Capture packet traces using tcpdump to analyze the traffic and identify any anomalies.

7. Consider AWS support:
- If the issue persists after these checks, it may be worthwhile to open a support case with AWS. They can investigate potential routing or infrastructure issues within their network that could be causing the packet loss.

Remember, network issues can be complex and may involve multiple factors. If the problem continues after these steps, engaging with AWS support for a more in-depth investigation would be advisable.
  

Sources
Troubleshoot connection to AWS service endpoints from Linux | AWS re:Post
How can I contact AWS regarding observed packet loss to ap-southeast-2 over the internet? | AWS re:Post