Mullvad VPN and Opnsense?

[borealis67]

I am having trouble with my DEC850v1 (opnsense 26.1.5) when using Mullvad clients on my Windows 10 PC.

I frequently lose my connection and have to reconnect all the time. After getting reconnected to the VPN the connection will work for a short time but usually soon after will quietly go dead. Meaning the Mullvad client with say it's still connected but when trying to access anything online the connection will sort of time out. Long pauses in loading before a loading error will occur. With my previous router (ISP provided) this would sometimes happen but not anywhere near as much as it does now.

Are there any known issues and solutions to issues like this? What can I check to try and find a solution?

Thank you.

[Patrick M. Hausen]

AFAIK Mullvad uses WireGuard which is

- UDP
- stateless, so if there is no traffic to be sent *inside* the tunnel, no traffic *outside* will happen, either
- so probably the NAT timeout hits your connections

Doesn't the Mullvad client permit to set a keepalive interval? If it does, set it to 25 seconds.

If it doesn't try changing Firewall: Settings: Advanced: Firewall Optimization from "normal" to "conservative".

HTH,
Patrick

[borealis67]

I am not sure what the specifics are regarding Wireguard and Mullvad. But I will try your suggestions. Thank you for the reply.