Wi-Fi not reconnecting after rebooting the router

Question

This question (and answer) relate to an obsolete OS and not relevant to ANY current system.

I have a Raspberry Pi B+ which is connected to my modem/router via a TP-Link TL-WN725N usb adapter. It works fine, however if i turn off the router and than back, the Raspberry doesn't reconnect automatically. I need to plug and unplug the adapter back.

This is the content of /etc/network/interfaces:

interfaces
auto lo
iface lo inet loopback

auto eth0
allow-hotplug eth0
iface eth0 inet dhcp

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

auto wlan1
allow-hotplug wlan1
iface wlan1 inet manual
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

I have a static ip reserved by the router

Answer 1

I had a similar problem I think. Try the wpa_supplicant.conf file without the full auto wlan1 entry so your config file looks like this: interfaces auto lo iface lo inet loopback

auto eth0
allow-hotplug eth0
iface eth0 inet dhcp

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

If this doesn't works, you can try the wpa.conf file instead of wpa_supplicant.conf file.

Answer 2

I have had similar problems on two of my networked Pis. On both, the issue was that I had done in-place upgrades on the systems and by mistake ended up with two network control packages running at the same time on both systems.

On one system I had dhcpcd and dhclient, on the other I had dhcpcd and wicd.

For the system with dhclient, the solution was:

Find out if dhclient (or wicd) is in use

ps -elf | grep dhclient

Then remove it

sudo apt remove --purge dhclient

Then reboot

sudo shutdown -r now

or sudo reboot

I followed a similar process on the system that had dhcpcd and wicd. There were multiple wicd packages running and I needed to remove all of them.