Prerequisites: a wi-fi adapter supporting "AP" (access point, or master) mode, such as Ralink RT5370.

In case you are using a Realtek 8188 or 8192 based adapter, follow these instructions for Realtek 8188 Wi-Fi adapter.

Execute:

sudo apt-get install hostapd

edit the file:

sudo nano /etc/network/interfaces

as follows:

auto lo

iface lo inet loopback

iface eth0 inet dhcp

#allow-hotplug wlan0

#iface wlan0 inet manual

#wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

#iface default inet dhcp

iface wlan0 inet static

address 10.0.0.1

netmask 255.255.255.0

edit the file:

sudo nano /etc/hostapd/hostapd.conf

as follows:

interface=wlan0

driver=nl80211

ctrl_interface=/var/run/hostapd

ctrl_interface_group=0

ssid=coderbot

hw_mode=g

channel=8

wpa=2

wpa_passphrase=coderbot

wpa_key_mgmt=WPA-PSK

wpa_pairwise=CCMP

rsn_pairwise=CCMP

beacon_int=100

auth_algs=3

wmm_enabled=1

edit the file:

sudo nano /etc/default/hostapd

as follows:

DAEMON_CONF="/etc/hostapd/hostapd.conf"

Execute:

sudo apt-get install dnsmasq

Edit the file:

sudo nano /etc/dnsmasq.conf

as follow:

interface=wlan0 # To get dnsmasq to listen only on wlan0.

dhcp-range=10.0.0.2,10.0.0.10,255.255.255.0,12h # This sets the available range from 10.0.0.2 to 10.0.0.5

dhcp-authoritative

dhcp-option=252,"\n"

no-resolv

no-poll

After a reboot a "coderbot" wifi network should be available (password: "coderbot")

Avahi daemon implements the mDNS (multicast DNS) which allows the raspberry to be located as coderbot.local when connected to a private WiFi (WiFi mode "Client").

sudo apt-get install avahi-daemon

To change the hostname from "raspberrypi" to "coderbot" edit the file:

sudo vi /etc/hosts

and modify the line:

127.0.1.1 raspberrypi

to

127.0.1.1 coderbot

Modify the file:

sudo vi /etc/hostname

from this

raspberrypi

to this

coderbot

then reboot, the raspberry will be discovered as coderbot.local