iPhone USB tethering problems

[SimonLew]

Hi all, first post here. I'm setting up OpenPlotter and PyPilot as a pi learning exercise so am firmly in the noob category. USB tethering was working great. Updated all the charts and then it stopped. I mucked around with no luck, re-imaged the SD card and still no joy. The iPhone goes into USB tether mode and it is recognized by the pi. However there is no internet connection. I'm running headless with an iPad, no problems. I also have VNC Viewer installed on the iPhone and it connects over USB no problem, just no internet. Tried two different iPhones and cables so don't think it's an iPhone problem. Mystery is why a fresh image worked great the first time but, after it stopped working re-installing the same image on the same SD card no longer tethers. ifconfig printout below. Any help would be greatly appreciated.

eth0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        ether dc:a6:32:54:92:f0  txqueuelen 1000  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eth1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 172.20.10.4  netmask 255.255.255.240  broadcast 172.20.10.15
        inet6 fe80::a04e:a7ff:fe12:fd7  prefixlen 64  scopeid 0x20<link>
        inet6 2600:380:952c:9198:a04e:a7ff:fe12:fd7  prefixlen 64  scopeid 0x0<global>
        ether a2:4e:a7:12:0f:d7  txqueuelen 1000  (Ethernet)
        RX packets 443  bytes 214040 (209.0 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 714  bytes 75703 (73.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 1769  bytes 165401 (161.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1769  bytes 165401 (161.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan9: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 10.10.10.1  netmask 255.255.255.0  broadcast 10.10.10.255
        inet6 fe80::dea6:32ff:fe54:92f1  prefixlen 64  scopeid 0x20<link>
        ether dc:a6:32:54:92:f1  txqueuelen 1000  (Ethernet)
        RX packets 35573  bytes 3007873 (2.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 27408  bytes 5985171 (5.7 MiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0