• Build the the bcm2708-rng kernel driver for support for the raspberry pi's hardware random number generator:

  sudo su -
  apt-get install build-essential bc gcc make
  cd /tmp
  wget http://www.mirrorservice.org/sites/raspbmc.com/downloads/bin/kernel/linux-headers-latest.deb.gz
  mkdir x
  dpkg-deb -x linux-headers-latest.deb.gz x
  mv -v x/usr/src/linux-headers-$(uname -r)/Module.symvers /usr/src
  cd /usr/src
  gKernel=$(uname -r | sed 's/[0-9]*$/y/')
  wget --no-check-certificate https://github.com/raspberrypi/linux/archive/rpi-$gKernel.tar.gz
  tar xzf rpi-*.tar.gz
  mv linux-rpi-*y rpi-linux
  cd rpi-linux/
  make mrproper
  zcat /proc/config.gz > .config
  sed -i 's/CONFIG_CROSS_COMPILE.*/CONFIG_CROSS_COMPILE=""/' .config
  apt-get install ncurses-dev
  make menuconfig
  cp /usr/src/Module.symvers .
  make modules SUBDIRS=drivers/char/hw_random/
  modprobe hwrng_register
  insmod drivers/char/hw_random/rng-core.ko
  insmod drivers/char/hw_random/bcm2708-rng.ko
  mkdir -p /lib/modules/3.12.31/kernel/drivers/char/hw_random/
  cp drivers/char/hw_random/bcm2708-rng.ko /lib/modules/3.12.31/kernel/drivers/char/hw_random/

• Install and start rngd to populate the local's system entropy pool from the hardware rng:

  sudo apt-get install rng-tools
  sudo bash -c 'echo "bcm2708-rng" >> /etc/modules'
  initctl start rngd

• Install NetRNG on both clients and the server:

  sudo apt-get install git python-virtualenv python-dev
  git clone https://github.com/infincia/NetRNG.git
  sudo mv NetRNG /opt
  cd /opt/NetRNG/
  git fetch --tags origin
  git checkout -b v0.1 v0.1
  virtualenv /opt/NetRNG/env
  source /opt/NetRNG/env/bin/activate
  pip install -r /opt/NetRNG/requirements.txt
  sudo cp netrng.conf.upstart /etc/init/netrng.conf 
  sudo cp netrng.conf.sample /etc/netrng.conf 

• Start the NetRNG server on the Raspberry Pi:

  sudo initctl start netrng

• Install and run the NetRNG client on each network machine:

  sudo vim /etc/netrng.conf
  # Set mode = client, and the server IP address
  sudo initctl start netrng

For systems that use systemd instead of upstart, use the following service definition:

/etc/systemd/system/netrng.service

[Unit]
Description=NetRNG Entropy Client
After=syslog.target
 
[Service]
Type=simple
ExecStart=/opt/NetRNG/env/bin/python /opt/NetRNG/netrng.py
User=root
 
[Install]
WantedBy=multi-user.target