Raspberry Pi

Network

Detect all Raspberry Pi on local network

From [1].

sudo nmap -sP 192.168.1.0/24 | awk '/^Nmap/{ip=$NF}/B8:27:EB/{print ip}'

where 192.168.1.* will be your local network mask.

We can also simply look for string Raspberry since nmap correctly identifies pi mac address:

sudo nmap -sP 192.168.1.0/24 | grep -B2 Raspberry

where 192.168.1.* will be your local network mask.

Setup Pi as WiFi HotSpot

This setup the Pi has a WiFi access point (AP) in router mode (NAT).

References:

• https://learn.adafruit.com/downloads/pdf/setting-up-a-raspberry-pi-as-a-wifi-access-point.pdf
• https://learn.adafruit.com/setting-up-a-raspberry-pi-as-a-wifi-access-point/overview
• http://blog.sip2serve.com/post/48420162196/howto-setup-rtl8188cus-on-rpi-as-an-access-point
• http://blog.sip2serve.com/post/48899893167/rtl8188-access-point-install-script

Troubleshoot

403 Forbidden when apt-get upgrade

From [2]:

Err http://mirrordirector.raspbian.org/raspbian/ wheezy/main libc-dev-bin armhf 2.13-38+rpi2+deb7u8           
  403  Forbidden
Err http://mirrordirector.raspbian.org/raspbian/ wheezy/main libc6-dev armhf 2.13-38+rpi2+deb7u8              
  403  Forbidden

Edit /etc/apt/apt.conf:

-deb http://mirrordirector.raspbian.org/raspbian/ wheezy main contrib non-free rpi
+#deb http://mirrordirector.raspbian.org/raspbian/ wheezy main contrib non-free rpi
+deb http://archive.raspbian.org/raspbian wheezy main contrib non-free
+deb-src http://archive.raspbian.org/raspbian wheezy main contrib non-free