Raspberry Pi Start ad-hoc mode on Start up

rpi_adhoc_networking.sh

1. sudo apt-get update
2. sudo apt-get install isc-dhcp-server

3. sudo nano /etc/default/isc-dhcp-server
> UPDATE LINE

INTERFACES="wlan0"

4. sudo nano /etc/dhcp/dhcpd.conf

DHCPDARGS=wlan0; #args for the dhcpd daemon -> limit DHCP to the wlan0 interface
default-lease-time 600;
max-lease-time 7200;

option subnet-mask 255.255.255.0;
option broadcast-address 10.0.0.255;
option domain-name "RPi-network";
option routers 10.0.0.1; #default gateway

subnet 10.0.0.0 netmask 255.255.255.0 {
    range 10.0.0.2 10.0.0.20; #IP range to offer
}

5. sudo nano /etc/network/interfaces

# start interfaces upon start of the system
auto lo

# register loopback interface
iface lo inet loopback

auto eth0
allow-hotplug eth0
iface eth0 inet dhcp

# use manual ip configuration for wlan0 interface and allow hotplug as well
auto wlan0
allow-hotplug wlan0
iface wlan0 inet manual

6. sudo nano /etc/rc.local

echo "Creating ad-hoc network"
ifconfig wlan0 down
iwconfig wlan0 mode ad-hoc
iwconfig wlan0 key aaaaa11111 #WEP key
iwconfig wlan0 essid RPi      #SSID
ifconfig wlan0 10.0.0.200 netmask 255.255.255.0 up
/usr/sbin/dhcpd wlan0
echo "Ad-hoc network created"