I am using CentOS3.8 (with kernel version 2.4.21-47.EL, iptables version 1.2.8-12.3, on AMD sampron x68_64). I want to restrict my users based on their MAC, and used the command: # iptables -A INPUT -m --mac-source 12:12:12:12:12:12 -j DROP but i am getting error : iptables v1.2.8: Couldn't load match `--mac-source':/lib64/iptables/libipt_--mac-source.so: cannot open shared object file: No such file or directory I also installed latest iptables version from the site ( iptables-1.3.6.tar.bz2) but still getting the same error. please help me. thanks, Alok Pathak