Learn how to configure Dead Peer Detection to automatically restart failed IKE sessions and maintain uptime for AWS Site-to-Site VPNs.
Table of Contents
Question
A company has an AWS Site-to-Site VPN connection between its office and its VPC. Users report occasional failure of the connection to the application that is hosted inside the VPC. A network engineer discovers in the customer gateway logs that the Internet Key Exchange (IKE) session ends when the connection to the application fails.
What should the network engineer do to bring up the IKE session if the IKE session goes down?
A. Set the dead peer detection (DPD) timeout action to Clear. Initiate traffic from the VPC to on premises.
B. Set the dead peer detection (DPD) timeout action to Restart. Initiate traffic from on premises to the VPC.
C. Set the dead peer detection (DPD) timeout action to None. Initiate traffic from the VPC to on premises.
D. Set the dead peer detection (DPD) timeout action to Cancel. Initiate traffic from on premises to the VPC.
Answer
B. Set the dead peer detection (DPD) timeout action to Restart. Initiate traffic from on premises to the VPC.
Explanation
The solution that will resolve this issue is B:
- Set the dead peer detection (DPD) timeout action to Restart.
- Initiate traffic from on premises to the VPC.
This will:
- Configure DPD to automatically restart the IKE session if it fails
- Triggering traffic from the on-prem network to the VPC will cause DPD to detect the failed session and restart it.
The other options will not fully address the problem:
A – Clearing the session drops ongoing VPN connectivity
C – No action taken on timeout allows sessions to remain down
D – Canceling does not restart the IKE session
Setting DPD to automatically restart failed IKE sessions, and triggering traffic to initiate session monitoring from the on-prem network is the optimal approach to maintain VPN uptime.
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