Hi, At the moment I have arroung 1.000 mikrotik routers with hotspot using freeRadius as auth and account. The radius server is on AWS Frankfurt and most of the clients are working ok. But there are some (10 or so) cliens that are losing always udp packets and arround 10% of request are lost. And also Form this locations some days the lost packets from that lacations increase to 100% . I can solve this routing the radius to a VPN directly from the router to the radius server and the 0% of lost packets. I've found this doc: <https://www.rfc-editor.org/pdfrfc/rfc6613.txt.pdf> https://www.rfc-editor.org/pdfrfc/rfc6613.txt.pdf And I really sure that the problem is that on some clients the packets are lost probably by the fragmentation of the udp packet that get lost. And when the ISP from that clients update, or change or noone knows why the result is that our upd radius packets are all lost. Anyone know if there is something I can do to improve this ? I've tried to change MTU on mikrotik but not success. Thanks,