Can’t access TrueNAS/FreeNAS over VPN

There was an issue accessing a TrueNAS device over the VPN. The VPN was assigning an Ip Address outside the network available to the TrueNAS host. In my case:

  1. VPN assigned IP address is in range 172.16.0.0/24
  2. Network for TrueNAS is in range 10.0.0.0/16

Since the VPN address is outside the range of the CIDR block for the TrueNAS ip address subnet, TrueNAS can’t respond to the incoming request. To fix this, add a Static Route for TrueNAS. To add a Static Route, expand the Network tab in the left hand menu and select Static Routes in the menu.

The left main menu in TrueNAS core with the Network tab expanded and the Static Routes tab within Network selected

From the Static Routes screen, click Add in the top right of the new screen. After that the following form will appear:

SettingValueDescription
DestinationintegerUse the format A.B.C.D/E where E is the CIDR mask.
In the example above it would be 172.16.0.0/24
GatewayintegerEnter the IP address of the gateway.
In the example above it would be 10.0.0.150 (150 is my gateway)
DescriptionstringNotes or identifiers describing the route.
The form fields for adding a static route in TrueNAS

After the fields are populated correctly, click “Submit” and the VPN connections should now be able to reach the TrueNAS core device.

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