We have a RUT240 in the field, that connects to a LAN and has a 4G WAN uplink. An OpenVPN has been established between the Teltonika and our office. This works and we can remotely access the LAN behind the Teltonika.
One of subnets behind the Teltonika is overlapping with an office subnet. As such, we need to NAT that subnet from our office end. The overlapping subnet is 192.168.127.0/24 and we have NATTED it to 220.127.116.11/24 (ping to 18.104.22.168/24 is sent to the Teltonika).
Now on the Teltonika, we need to forward the ping towards 22.214.171.124 to 192.168.127.0 AND masquerade the source to be the Teltonika (otherwise the end device does not know how to send a reply back). How can we accomplish this?
I am afraid of just testing stuff, as the remote site is 3 hours away and is hard to get access to.