The end goal / topology is: RS232 P2P via 4G through VPN, maybe with remote/WAN admin. I have struggled for days with this, no luck.
Have ISP VPN and 2 dedicated SIMs and static private IPs 10.30.xxx.xx4 and 10.30.xxx.xx3,
(this has been tested on a couple of Racom routers and works ok.)
I never expected to reach this goal in one jump, so with my limited network knowledge I'm taking one step at a time .
A) Starting with only one TRB142 gateway with a normal/standard SIM card: getting WAN via 4G works ok, can browse the web from PC on LAN (USB), I can ping the box, and RS232 - Hercules works perfectly.
B) From a different PC on WAN I get no ping reply, can not connect with WebGUI, the box is basically invisible on WAN.
Have tried 'all sorts' of FW settings/rules but still no kind of contact with the box, not even a ping reply.
Have no special routing configured, cant see its needed. I figure there must be a blockage somewhere...
Attached troubleshoot file.