Hi Any hints about the following problem will be appreciated. Thanks a lot... I want to assure that only given ip/mac matches will access to the internet (i mean if someone takes the ip that does not belong to his/her mac address no access will be given) . I will give the ip to the mac address by the dhcp.. In my knowledge, i want to set these ip/mac groups using the command: arp -s ip mac and i want to redirect unused ip to an unused mac with the same way... Here comes the problem.. How can i define in iptables to use these arp rules and give access only the one addresses that match the rules and should block all the others ( well i want to block the others [unused ip addresses by using iptables mac macth module ] ) . ? Any hints ? Thanks for your valuable help...