Troubleshoot VPN Tunnel Inactivity or Instability Issues
For VPN tunnels failing due to DPD, verify that the customer gateway device responds to DPD messages (that is, UDP 500 and UDP 4500 packets) from AWS VPN endpoints. Make sure that the customer gateway device is not too busy to be unable to respond to the DPD R-U-THERE messages from the AWS peers, or rate limiting these packets due to IPS features enabled in the firewall.
For tunnels going down due to idle timeout, be sure there is constant bidirectional traffic between your local network and VPC.
Consider setting up a host that sends one ICMP requests every 5 seconds to an instance in the VPC that responds to ICMP. This allows the tunnel to stay up as it continues to respond to the ICMP requests, and makes sure that there are packets being encrypted and decrypted across the tunnel.
For more information about configuring vendor-specific network devices, see the AWS VPC Network Administrator Guide.
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