Realtek 8188 Wi Fi adapter

If you are using a Realtek 8188 based wifi adapter, perform the following steps:

Verify kernel version

Execute

uname -a

Then, read the following post and select the correct driver version:

http://www.raspberrypi.org/forums/viewtopic.php?p=462982#p462982

and select the correct date for kernel driver version

Get the kernel drive object:

https://dl.dropboxusercontent.com/u/80256631/8188eu-201xyyzz.tar.gz

(x = Year, yy = Month, zz = day)

get the file with the following command:

wget https://dl.dropboxusercontent.com/u/80256631/8188eu-201xyyzz.tar.gz <--set data code for driver version above

tar -zxvf 8188eu-201xyyzz.tar.gz <--set data code for driver version above

sudo install -p -m 644 8188eu.ko /lib/modules/$(uname -r)/kernel/drivers/net/wireless

sudo insmod /lib/modules/$(uname -r)/kernel/drivers/net/wireless/8188eu.ko

sudo depmod -a

hostapd (Access Point)

In order to use the adapter in AP (Access Point) mode, a custom hostapd executable and configuration is required.

Install the standard 1.0 hostapd following the istructions here

Then, get the customized executable:

wget http://www.daveconroy.com/wp3/wp-content/uploads/2013/07/hostapd.zip

unzip hostapd.zip

sudo mv /usr/sbin/hostapd /usr/sbin/hostapd.old

sudo mv hostapd /usr/sbin/hostapd

sudo chown root.root /usr/sbin/hostapd

sudo chmod 755 /usr/sbin/hostapd

Modify the hostapd configuration with the command:

sudo nano /etc/hostapd/hostapd.conf

Modify the line "driver" as follows:

driver=rtl871xdrv

Save the file and reboot, the configure dnsmasq as explained here