@processor In this case I’d ask you to update to the latest development version. There is a minor issue with 1.5.7 on Ubuntu and it’s better you use the latest version in case we still need to work on fixing the multicast issue.
sudo -i
apt-get update
apt-get install git
git clone https://github.com/FOGProject/fogproject
cd fogproject
git checkout dev-branch
cd bin
./installfog.sh