RouterOS: OpenVPN server randomly gets stuck

RouterOS General
1

Hello:

I am experiencing some issues with an OpenVPN server deployment running on RB4011iGS+ with RouterOS v6.48.6 and level 5 license

The router is managing about 150 OpenVPN clients but about once a day it gets stuck, some connections continue working, and other clients get disconnected. OpenVPN port is reachable but clients can’t connect until I reboot the router.

I don’t know if the issue is related to the capacity of the routerboard but I can’t see too much resource consumption, load is pretty low: average CPU is 3% and RAM 70 MiB.

Throughput in the WAN interface also seems normal: less than 1 Mbps Tx, 400 kbps Rx

OpenVPN logs don’t show anything abnormal.

Is the RB hardware enough to manage the number of clients? I guess if it were a hardware/capacity problem I would notice a higher resource usage, wouldn’t I?

Any help to debug what is going wrong?

Thanks in advance

2

Have you checked in newer version of ROS do have any OpenVPN changes that could solve your problems?

3

Yep, I want to upgrade to RouterOS 7 but I need to plan the upgrade because it is a production system with lots of clients with different SOs and architectures.
Anyway, if RouterOS 6 isn’t able to support the load due to missing features (offloading, UDP support, etc) I think there should be signs of high resource consumption, but that is not the case.