I have an external IP NATing to an internal IP. I have verified the NAT is working by pointing it to an internal PC and testing various ports (mainly 6690, Synology's Cloudstation port). Currently for testing, I have all ports open for this IP so I do not think it is a port issue.
Internally the synology DSM and Cloudstation are accessible. The SonicWall and Synology syslog logs are surprisingly not of much help. I also called Synology and worked through some of their pre-tech support steps and ultimately they were not of much help other than to suggest buying a low-end home-based router.
Any help would be greatly appreciated,