I have two CPEs. One fast 4G CPE (High Speed, 150 GB/m and one slow 3G CPE (2 MBPS,U/L)
Primary 4G CPE which is basically my primary high-speed internet access is shared through a router and switch for LAN connections. Pi's ethernet is connected to this network. I access Plex, Sonarr, Deluge installed on Pi through the wired network backed by high-speed 4G CPE.
I have another secondary 3G CPE (wireless only, no ethernet port) which is slow but has unlimited download. Pi's WiFi is connected to this other slow 3G CPE.
My use case is I have to download using Secondary Wireless only 3G CPE and use Pi's LAN(backed by 4G CPE) only to access home network and Plex etc.
Scenario 1 - When I connect both WAN and LAN, Pi connects to internet through LAN only.
Scenario 2 - When I connect to LAN and WAN but disable internet using LAN from Router, the internet doesn't work. Pi doesn't use WAN internet when LAN is connected even if it doesn't have internet access
Scenario 3 - I download stuff by running
sudo ifconfig eth0 down so Pi has only WiFI and it downloads from slow 3G Network
Scenario I want - Connected to LAN with internet access disabled from Router and only have home network access. Connected to WAN and used to access internet through 3G CPE.
How Do I achieve this?