AWS Services Inaccessible via Jio 5G IPv6 - Connection Issues

The connectivity issues you're experiencing between Jio's 5G IPv6 addresses and AWS services could be due to several factors. Here are some potential causes and suggestions to troubleshoot:

1. IPv6 Configuration: Ensure that your VPC, subnets, and route tables are properly configured for IPv6 traffic. Check that there's a route for IPv6 traffic (::/0) to an internet gateway in your route table.

2. Security Groups and Network ACLs: Review your security group rules and network ACL settings to confirm they allow inbound and outbound IPv6 traffic on the necessary ports (e.g., 443 for HTTPS).

3. DNS Resolution: Verify that DNS64 is enabled for your subnet, which can help with IPv6 to IPv4 translation when needed.

4. NAT Gateway: Consider using a NAT gateway to allow IPv6-only instances to communicate with IPv4-only AWS services. You can create a route for traffic to '64:ff9b::/96' that forwards to the NAT gateway.

5. VPC Endpoints: For services like EKS that may not fully support IPv6, you might need to set up VPC endpoints to ensure connectivity.

6. Firewall Settings: Check for any third-party firewalls or security appliances in your VPC that might be blocking IPv6 traffic.

7. ISP-related Issues: The problem could be on Jio's end. You may want to contact their support to see if they're aware of any IPv6 connectivity issues with AWS.

8. AWS Support: If the issue persists after checking these points, consider opening a support ticket with AWS to investigate potential network-level problems between Jio's IPv6 infrastructure and AWS.

9. Temporary Workaround: As a short-term solution, you could try forcing IPv4 connections or using a different network that supports IPv4 to access critical services.

Remember that not all AWS services fully support IPv6 yet, which could contribute to the issues you're experiencing. Keep an eye on AWS updates for improved IPv6 support across their services.

Sources
SSH IPv6 stopped working | AWS re:Post
IPv6 support in AWS | AWS re:Post
Troubleshoot connection to AWS service endpoints from Linux | AWS re:Post
NLB Connection issues through IPv6 | AWS re:Post