A customer has established an AWS Direct Connect connection to AWS. The link is up and
routes are being advertised from the customer’s end; however the customer is unable to connect
from EC2 instances inside its VPC to servers residing in its datacenter.
Which of the following options provide a viable solution to remedy this situation? Choose 2
answers

A.
Modify the instances VPC subnet route table by adding a route back to the customer’s onpremises environment.

B.
Enable route propagation to the customer gateway (CGW).

C.
Add a route to the route table with an IPsec VPN connection as the target.

D.
Enable route propagation to the virtual private gateway (VGW).

E.
Modify the route table of all instances using the route’ command.

Explanation:
https://myawsscribble.wordpress.com/2015/09/25/setting-up-and-configuring-aws-directconnect/