I have connected 2 aws regions with transit gateway.
Region 1 frankfurt has 3 private subnets and 3 public subnets, the private one has its route table with a Nat interface and local subnet route (172.10.0.0/16), while the other has the local route and Region 2 Tokyo single subnet (172.20.0.0/16).
On region 1 i have EKS with 3 worker nodes, which are running on the 3 private subnets, and its is reachable from the region1 public subnets.
I have an nginx (example.com) on EKS behind an internal load balancer, which when i do nslookup resolves in 3 private IPs (which are not the ones, of the 3 workers nodes, on the load balancer target groups).From the Region 1 subnet using an EC2 i get response from all 3 IPs of the Load Balancer.
So this is my first question , where can i find where these 3 IP addresses are connected to ? (they look like they are part of the private subnets)
I think Found the answer to the first question (those 3 IPs are the ones of the Classic Load Balancer nodes), one for each AZ. Right ?
I added on Region 1 private subnet route table the subnet IP of the Region 2 subnet (172.20.0.0/16), now i can reach the service (nginx example.com) only on 1 of the 3 ips which resolves , on the 2 others i get Connection Time out.
what am i missing ?
thanks a lot
checked security groups of the Nodes in the target groups, of the Classic Load Balancer.
Checked the route tables