SoftEther local bridge with tap in Network Manager

[katzz0]

Hello,

I have SoftEther stable version 4 (SSTP only) with SecureNAT enabled working in my environment. I have home network with an a router and an ISP providing a DSL connection. SoftEther is installed on Raspberry pi 4B.

The problem is that I want to configure a local bridge with a tap device to work with Network Manager. Since I use Raspberry pi 4B there is only one ethernet port.

I'm able to create a tap device named like `tap_se0`. Though Network Manager doesn't want to work with that device. It's unmanaged and when I make it managed it says it's not connected. There is no way to up the tap connection. Attempts to add it to a bridge created by Network Manager are unsuccessful.

I read through related post on the forum and checked tons posts on the internet. Folks suggest to use bridge-utils, iproute2 and the other low level stuff. I managed to have unreliably working configuration by using ip command from iproute2 package. SSTP connection works for a short period of time. The problem with bridge-utils, iproute2 and etc is that these tools are low level and don't create persistent entities like bridges and connections. I read about problems that it can easily be broken by down connection or disconnected ethernet cable. Obviously it adds an additional burden of creating some startup scripts and making sure it works as expected.

My question is there a way to use Network Manager to set up a local bridge with a tap device created by SoftEther? Or it's a known limitation and maybe should be documented?

Thank you