I’ve tried the connections over UDP as well however the zeroshell device connects both tunnels to the IP of the first tunnel and then the “bonded” speed is only the speed of a single connection because only the first is used.
I’ve tested both connections and get roughly 5Mb/s down and 0.6Mb/s upload on each. When using the VPN bond I get 1.5Mb/s down and 1Mb/s on the upload. The bond is working perfectly on the upload but not on the download!
I’ve had a look at all the other posts of similar issues but there doesn’t seem to be a solution found yet.