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Getting a Ubiquiti USG (or UDM, UDM-Pro) using VPN to work with SmartSDR (win)

NT1K Member ✭✭

I have Ubiquiti USG with VPN enabled. The VPN works great for everything but the flex (6400). I was wondering if anyone has successfully used their USG/UDM/UDM-Pro with their flex 6000 series radio VIA VPN. If so, what exactly did you do in the controller to get it working.

I understand that SmartSDR uses discovery and has to be on the same subnet as the VPN but this is a little bit outside what I know. Any help would be appreciated.

There are a few reasons I would like to use a VPN instead of SmartLink. Mostly security concerns (close as many doors as possible) and I have other devices (rotor/switch) that I control locally. I also don't want to go out and purchase a RasPi and setup Softether.

Thanks, NT1K


  • Ha Gei
    Ha Gei Member ✭✭✭
    edited October 2021

    I am pretty sure the USG uses a "L3" routed VPN. The only VPN i know that is pure "L2" ( OSI Layer 2 ) is softethernet and i remember there once has been another bespoke VPN doing layer2 traffice..can´t remember what it was. The Flex needs Layer 2 Network as it uses L2 broadcasting to distinct between direct connection or smartlink need.

    Softethernet works perfect with the flex and other networked radios.


  • NT1K
    NT1K Member ✭✭

    Thanks. I'm aware of Softether but that involves the purchase of a RasPi. I was hoping to take advantage of the hardware I currently own and use. Thank you!

  • KD0RC
    KD0RC Member, Super Elmer Moderator

    I use the SoftEther VPN with an old laptop. This lets me control my amp, tuner and rotator as well as connecting my TeensyMarstro when I am remote. Although I normally use SmartLink, I can connect SmartSDR to the radio this way.

    I am thinking of getting a Raspberry Pi just to experiment with, but I don't need it to run SoftEther.

  • WX7Y
    WX7Y Member ✭✭✭✭

    I have even ran SoftEther on the same computer I always use for the local SmartSDR operation when I'm home.

    I now run mine on my Windows PLEX server which is on all the time anyway if it wasn't I would run it on a Raspberry Pi, It would probably even run fine on my Raspberry Pi4 that is running my Node-Red service which is GREAT for station control while running remotely.

    good luck




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