The ndpi-netfilter is a project that I appreciate, but unfortunately has not been updated constantly. I made some adjustments that allow the build on Ubuntu 14.04 (or newer kernel). I updated the project on github (making a new fork): https://github.com/betolj/ndpi-netfilter You can build into Ubuntu 14.04 (may be 12.04 too) with this steps: https://github.com/betolj/ndpi-netfilter/blob/master/ndpi.install Check if nf_conntrack_netlink is running: lsmod | grep netlink If true... remove after load xt_ndpi with: rmmod nf_conntrack_netlink modprobe xt_ndpi -- To unsubscribe from this list: send the line "unsubscribe netfilter" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html