Has that disclaimer always been in libnfnetlink home page[*]? It is the first time I see it. I have a userspace filter[†] working with it, and it currently works well. If I remove -lnfnetlink from the link command, I get just one undefined reference to symbol 'nfnl_rcvbufsiz'. It is used only if there is a command line option to set the buffer size to a given size, to avoid enobufs. For the rest, the daemon uses libnetfilter_queue. Should I rewrite that? How? Best Ale -- [*] https://netfilter.org/projects/libnfnetlink/index.html [†] https://savannah.nongnu.org/projects/ipqbdb/