I forgot to add a couple of things. I have tried adjusting the receiver buffer size with nfnl_rcvbufsiz and also adjusted the rmem and wmem-proc variables. I currently just use the test application that comes with the code, but I never forward the packets (the callback-function just returns 1). Of course the final application want to do this, but my goal is to find out about the buffersize, how many packets I can keep on the NFQUEUE and how to make sure I later stay within the limits. When testing I use iperf and what happens is that the test application suddenly stops printing out messages (after queuing 37 packets). Thanks, Kristian -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html