After spending time with Fortigate and Meraki today we were able to achieve tunnel connectivity. There were multiple issues so I thought it would be a good idea to post them in case anyone else ever comes across this same issue. First, when establishing a tunnel to a non-Fortigate vpn peer, object groups/names are advised against. Using the subnet is the way to go . Second, Fortigate side had to turn off Nat Traversal (I found this odd but it worked) Third, MTU had to be adjusted due to the Fortigate sending Jumbo frames.
... View more