I'd like to develop the XDMCP extension module for NAT... So I'd read the /usr/src/linux/net/ipv4/netfilter/ip_nat_ftp(irc).c and ip_conntrack_ftp(irc).c sources... But I knew that I must edit the ip_conntrack.h file for support my own module... that is, helper of "struct ip_conntrack" How can I solve this problem gracefully? If I release my module, I must release my module and my own ip_conntrack.h ? I think it's not good... Please let me know my fault if exists, and help me... Thanks for reading...