Dec 2017 With a new RPi 3, Model B I installed the latest Raspbian Stretch. Built in wifi wlan0 does not connect. When running
sudo iwlist wlan0 scan I see my router and others. Yet ip addr shows
ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether b8:27:eb:df:2d:e1 brd ff:ff:ff:ff:ff:ff inet 192.168.0.16/24 brd 192.168.0.255 scope global eth0 valid_lft forever preferred_lft forever inet6 ::884:38ea:542:9997/64 scope global mngtmpaddr noprefixroute dynamic valid_lft 3599sec preferred_lft 3599sec inet6 fe80::5fcf:899a:bca5:5b8d/64 scope link valid_lft forever preferred_lft forever 3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN group default qlen 1000 link/ether b8:27:eb:8a:78:b4 brd ff:ff:ff:ff:ff:ff My /etc/wpa_supplicant/wpa_supplicant.conf looks like this:
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev update_config=1 country=GB network={ ssid="my-ssid" psk="my-password" key_mgmt=WPA-PSK} (the closing curly brace is correct in the file)
my /var/log/syslog contains this snippet:
Dec 17 15:25:44 raspberrypi dhcpcd[360]: DUID 00:01:00:01:21:b0:d9:e1:b8:27:eb:8a:78:b4 Dec 17 15:25:44 raspberrypi dhcpcd[360]: wlan0: IAID eb:8a:78:b4 Dec 17 15:25:44 raspberrypi dhcpcd[360]: wlan0: adding address fe80::ea80:de60:3e85:442f Dec 17 15:25:44 raspberrypi dhcpcd[360]: wlan0: carrier lost Dec 17 15:25:44 raspberrypi dhcpcd[360]: wlan0: deleting address fe80::ea80:de60:3e85:442f I found a thread somewhere that suggested adding a line to /etc/rc.local
rc.local:
# Print the IP address _IP=$(hostname -I) || true if [ "$_IP" ]; then printf "My IP address is %s\n" "$_IP" fi /sbin/iw dev wlan0 set power_save off exit 0 ifconfig wlan0:
wlan0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether b8:27:eb:8a:78:b4 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 Is there further configuration? Is my configuration correct? I've looked at the password and ssid twenty times, it's correct. Could the conflict be WPA vs WPA2 and my router? Is there a way to diagnose it?
Edit: I edited my wpa_supplicant.conf to connect to an old Netgear router and the wifi on wlan0 connected right away. So something with the router (Comcast) is not working correctly. Every other wifi device connects fine, laptops, cell phone wifi, iPad, smart TV. My router from the ISP has two Wifi networks. One has a long SSID XXXXXNNNNXXXNN and another XXXXXNNNNXXXNN-5G. I tried both in my wpa_supplicant.conf but the RPi only seems to see XXXXXNNNNXXXNN when scanning with iwlist. Here is some good info, namely you can't use the 5G network.
My router has two WPA choices: WPA/WPA2-PSK(TKIP/AES) and WPA2-PSK(AES)
I tried both and restarted the RPi network services. Still won't work. Also router was using CH 12, changed to CH 4.
Also used a USB wifi dongle with RTL8188CUS chipset. It connects to the Netgear router, not the Comcast router.
I'm going to have to piggyback the Netgear to my ISP router. It's a bandaid until I can figure it out. I would like to blame the router but everything else can connect to it except multiple RPis. So annoying.
