Hi, I have successfully applied patch for "nth" module but when i am trying to add the following RULE for testing purpose:- "iptables -A INPUT -p icmp --icmp-type echo-request -m nth --every 2 -j DROP" It throws a message "iptables: No chain/target/match by that name". The steps i have followed to apply the patch for "nth" are:- 1 Apply the the patch for "nth" using patch-o-matic. 2 Recompile kernel 3 make and make install the iptables package. I am trying it with kernel v2.6.14.2 and iptables v1.3.4. After,the above failure i have tried the another way to use "nth", add nth as a Module as follows:- First i wrote a Makefile ---------------------------------------------------------------- obj-m += ipt_nth.o all: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules clean: make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean ----------------------------------------------------------------------- then execute #make #insmod ./ipt_nth.ko It works.Now,i am able to use nth module. So,please tell what i missed or did wrong in patch-o-matic procedure. Thanks Vikrant