Thank you @jerdung - In case any non-network-expert like me happens by this post, here are the differences I’ve found in the GRE fields between versions. v4.17 has a different way to enter the network information of the remote site. CIDR notation of the “local” network seems to make this a more secure device than v4.16 and prior. In our scenario, the local network is 192.168.103.0/28 - I had been over-comparing the two fields between versions. Now that SW support helped me with the correct entries, it seems like a no-brainier. I’ll put up screenshots of the 2 different ways we filled out the GUI to accomplish our GRE VPN back to the mother-ship. If I had just seen this example, it would of helped me to figure it out. Maybe,
