I am new to netfilter framework and have been dabbling through the code a= nd writing some simple examples of my own. I used ntohs() in my module code and it compiles fine. But when I insmod = it, it says = syn.o: unresolved symbol ntohs Could someone tell me what is happening or what am i doing wrong? I followed ntohs and it seems to be merely a #define and I am sure I incl= uded all the relelvant ones.