I have spent quite a bit of time trying to find a way of adding a GRE tunnel to my UTM, but I feel like I am hitting a brick wall. From my searching, it would appear that others have attempted this several years ago, with no real guidance on wither they were successful or not.
Does anybody know if it is possible to add a GRE tunnel to the Sophos UTM? I have a tunnel that I'd like to connect to the UTM, so that I can route SMTP traffic through it. I seen reference to Sophos XG having the ability to connect to GRE tunnels, so I actually downloaded and installed this on a VM and I can't see this functionality. I can see only the exact same site-to-site options as I see on the Sophos UTM?
Appreciate any advice that you may be able to provide.