I've been trying for a few hours to get OpenVPN working with AWS EC2 without any luck. Its the same setup as anyone would think of: Openvpn running on a server to gain access to resources within the VPC (private address space).
I've turned off "check source / dest" address on ALL instances, without luck.
VPN: 10.9.0.0/16 VPC: 172.16.0.0/16
I can connect to the VPN fine and ping 10.9.0.x fine. Can also ping the private address on the same box as the VPN. The two boxes can ping each other (private or public) just fine.
The problem's with AWS. Can I do NAT on this somehow so it thinks the packet is originating from the private address space?
[root - openvpn]# tcpdump -i any -n icmp 01:15:00.571096 IP 10.9.0.6 > 172.31.88.99: ICMP echo request, id 56638, seq 16, length 64 01:15:00.571125 IP 10.9.0.1 > 10.9.0.6: ICMP host 172.31.88.99 unreachable - admin prohibited, length 92