Hi there, Another one for you. In the docs at https://www.netfilter.org/projects/libnetfilter_queue/doxygen/html/ there is given a command to compile the sample code in nf-queue.c. The command given is gcc -g3 -ggdb -Wall -lmnl -lnetfilter_queue -o nf-queue nf-queue.c Here, and I suspect almost everywhere else, that doesn't work. Should the command not be something more like the one below? gcc -o nf-queue nf-queue.c -g3 -ggdb -Wall -lmnl -lnetfilter_queue -- 73, Ged.