Pi Ad Hoc Creator

This bash script performs the following:

• Checks for the type of Pi:

  • Raspberry Pi 2 Model B
  • Raspberry Pi 3

• Checks for either:

  • internal wireless chipset for Pi - 3
  • external wireless chipsets for Pi - 2

• Adds appropriate kernel modules in the /etc/modules folder for boot

• changes the /etc/rc.local file for setting up an ad-hoc network on boot with following parameters:

  • Mode Ad-Hoc
  • Channel 1
  • ESSID test-adhoc
  • Tx power to 0dBm (if possible)

• Changes the /network/interfaces file and other networking files to provide:

  • IPv6 SLAAC addresses on wlan0
  • no IPv6 addresses on eth0

External Wireless Chipsets

• ONLY dongles with following drivers are capable to work in ad-hoc operation:

  • r8188eu
  • rt2x00lib

• Edimax 7811UN with 8192cu drivers are INCOMPATIBLE.

Accessibility

Pis can be accessible once running the script and rebooted using:

ping6 -I wlan0 ff02::1

from a native Linux PC with the Same ad-hoc network configuration or from a Pi with the same configuration. Pis are addressed with fe80:: link-local addresses.

to perform ssh in to the pi:

ssh -l pi fe80::abcd:1ff:fe22:dead%wlan0

the %wlan0 is important

to perform scp use [] as follows:

scp someFile.txt pi@[fe80::abcd:1ff:fe22:dead%wlan0]:/home/pi/

Requirements

Just your Pi with an external chipset based USB dongle and root privileges to trigger the script.

sudo ./adhoc_setup.sh

ISSUES with External Dongles

• r8188eu chipsets are miserable with not letting the user set txpower and also channel parameters. txpower will return an Error, whileas channel set to another value will not.

• even upon setting sudo iwconfig wlan0 channel 06 or another value, only the default value of channel 1 i.e. 2.412 GHz is set.

License

Issued under MIT License