I have searched many forums for an answer to my problem. I am using Stretch on RPi 3 and I have at last managed to set up wlan0 as an access point and iptables through to eth0 (enx...) to be able to connect to the internet. What I am trying to do now is to route wlan0 to a second wifi dongle, wlan1 (wlx...) through to the router.
I can get wlan1 to connect to my router by adding to /etc/wpa_supplicant/wpa_supplicant.conf
and this works fine.
The problem is as soon as I add this to wpa_supplicat.conf my wlan0 AP completely disappears. Take the lines out and the AP comes back but now wlan1 won't connect. It took me quit some time to get the wlan0<->eth0 bit working, but I am now stumped.
Andy ideas, ta, Andy.