I have observed that with iptables nat enabled , return ICMP pkts(not the TCP pkts) directly enter INPUT hook without passing through Prerouting hook???Why is this so???? Is it possible to redirect a pkt from INPUT hook to prerouting hook????? By the way, i am using iptables queuing(libipq for queuing pkts to user spaceapplication that is doing the nat..I am checking that if the pkt has come to prerouting, then do so and so..Because, actually the ICMP reply pkt is not meant for nat box but other m/c inside LAN,my appliocation shld reNAt it to ip of destination m/c and then forward it.. but if it enters input hook, i have no control of redirecting the pkt to the destination m/c on LAN even if i reNAT it correctly) Pls somebody help me out of this situation..IT'sreally URGENT............... Thanx in advvance, Paridhi __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com