I have a Raspberry pi 3 with
Raspbian GNU/Linux 9.9 (stretch) and I am trying to use a USB Wifi dongle (
Realtek Semiconductor Corp. RTL8188SU 802.11n WLAN Adapter). The external wlan adapter has an external antenna with extended range.
When I restart the Pi, and check
iwconfig, only the internal wifi interface is listed, I first have to disconnect and reconnect the dongle for wlan1 to appear.
lsmod, I know the
r8712u module is loaded at startup.
However, even after reconnecting the dongle I can only connect to wifi networks on wlan0 (internal) see figures 1 and 2.
/etc/network/interfaces I have added
auto wlan0 and
auto wlan1, however this doesn't appear to make a difference.
I have also tried to install the realtek firmware but it is already installed
sudo apt-get install firmware-realtek Reading package lists... Done Building dependency tree Reading state information... Done firmware-realtek is already the newest version (1:20161130-3+rpt4). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Before I installed a fresh raspbian, I was able to see two wifi adapters and select/connect to a network with either interface. I would very much appreciate help on how to resolve this issue. Please let me know what other information I can provide which may help.