This is a script for installing _and_ running babel on all interfaces except for eth0.

babel-install-and-run.sh

sudo apt-get update

# Install the babel routing daemon, mtr fancy traceroute, and nodejs (for the babelweb node)
sudo apt-get -y install babeld mtr npm nodejs-legacy

# Turn on martian logging ???
sudo sysctl -w net.ipv4.conf.all.log_martians=1
# To see log: sudo tail -f /var/log/syslog
# To turn off reverse path filtering:
sudo sysctl -w net.ipv4.conf.default.rp_filter=0
sudo sysctl -w net.ipv4.conf.all.rp_filter=0

# Get a list of all experiment interfaces
ifs=$(netstat -i | tail -n+3 | grep -Ev "lo|eth0" | cut -d' ' -f1 | tr '\n' ' ')

# remove InstaGENI-generated automatic routes
# and turn off reverse path filtering
for i in $ifs; do 
  sudo ifconfig $i down
  sudo ifconfig $i up
  sudo sysctl -w net.ipv4.conf.$i.rp_filter=0
  # Turn on IPv4 and IPv6 forwarding
  sudo sysctl -w net.ipv4.conf.$i.forwarding=1
  sudo sysctl -w net.ipv6.conf.$i.forwarding=1
done

sudo babeld -g 33123 -D -d 1 -C 'redistribute local if eth0 deny' "$ifs"