Trying to set up mysterium node

[actionhenkt]

Hello,

im trying to set up a mysterium node in a DMZ on opensense. Mysterium is a dVPN service running wireguard server in it. From the outside im able to forward traffic to the mysterium node and can see it connect to the node, but im having problems getting traffic back out from the node. The wireguard set up in the mysterium node sets up its own subnet 172.18.0.0/16 as "allowed subnet". I dont know how to allow this traffic to pass out. My DMZ has subnet 10.42.246.0/24 im not sure if this is the problem ?

I tried entering the subnet range 172.18.0.0 in an alias an allow it through using a rule with the alias set a source but the default rule keeps blocking the traffic. Tried all kinds of nat rules but still being blocked..