SD-WAN: Adding a second internet connection with a Mobile to Ethernet Gateway using an iPhone and a Raspberry Pi !! IOS 14.x not working !!

I was looking for a way to test SD-WAN and wanted to use my 2nd SIM card for this purpose.

The Guide from here worked for me for both Android and iPhone (OS 12.4, 13.x)

http://w6kd.boards.net/thread/146/usb-tethering-instructions-raspberry-star

and then you need to configure raspi to serve this connection via ethernet, same post; comment from bicly (but I put the iptables into rc.local)

- assign fixed IP on ethernet
- DHCP server via dnsmasq
- NAT connections on port (usb0 for android, eth1 for iphone)




Android Mobile Phone

- Connect Phone via USB Cable to the Raspberry Pi
- Under settings enable USB tethering
        - This step has to be re-done after every reboot of the raspberry pi or usb cable reconnection
- Raspberry Pi preparation according to first article and 2nd article