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Hrvoje Basic avatar Server

OpenVPN AMI instance - routing doesn't work

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Hrvoje Basic

I have an OpenVPN AMI instance and an Ubuntu micro behind it on AWS. The configuration is correct when I use NAT on OpenVPN. I can reach the Ubuntu micro through the tunnel and I have NAT gateway configured for that server. The OpenVPN configuration allows only the VPC traffic to go through the VPN. However, when I switch to Routing, I cannot access the Ubuntu micro any more. I've done the following:

  1. OVPN VPN Settings: Use NAT and allowed subnet 172.31.0.0/16 (which is my range on VPC). Unchecked "Should client Internet traffic be routed through the VPN?"
  2. OVPN Advanced VPN Server Config: push "route 172.31.0.0 255.255.0.0"
  3. OVPN client config: Use Routing and allowed networks 172.31.0.0/16
  4. VPC: On all network interfaces and instances stopped source/destination checking
  5. ACL allows all inbound and outband traffic with source 0.0.0.0/0
  6. Security groups also allows traffic with source 0.0.0.0/0
  7. VPC Routing tables: 172.31.0.0/16 -> local and 0.0.0.0/0 to NAT or Internet gateway
  8. tracert from my Windows VPN client shows

1 18 ms 18 ms 18 ms 172.27.232.1 2 * * * Request timed out.

Just by switching from Routing to NAT in the OpenVPN admin interface, without changing anything else, everything works fine. But I just cannot make the Routing to work.

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