Hi all. I’m hoping someone will recognize these symptoms. I have two high end Qnap NAS’s connecting over the internet on 1gbit connection. I did the initial sync of these nas with syncthing on a local 10 GigE network and that worked at around 300 MB per second. When I connect them over the internet they start for the first minute or so at 180 Mbps and are nice and constant. Then the speed drops down to an average 8 Mbps and it becomes spiky where I get speeds of around 80 Mbps for a second and the right down to zero for a second or two and back again like a pulse. If I pause the sync and start it up again I once again get a short period of high consistent speed and then it drops back to that pulsing speed. This interaction only happens in one direction. data flow from NAS A to B is smooth and consistent (although at relatively low speeds Due to asynchronous internet connection on A). From NAS B to A however I get this interaction.
Both locations have port 22000 forwarded to the qnaps. Both sides have the other sides external facing IP address and port 22000 entered instead of dynamic for an address and I have turned off relays.
Does anyone have thoughts on what I am missing?