Hi. My ISP has provided me with 5 fix IP. I want to set up linux bridge machine with 3 interface; eth0 -> adsl modem(Aztech 305EU- supporting pppoe,pppoa, half bridge,bridge mode) eth1 -> DMZ eth2 -> LAN My configuration. eth0 eth1 eth2 br0 == eth0 & eth1 My problem is I can't figure out how to pass public ip to my DMZ, because lan interface on the modem is private ip. I'm a newbie. Please advice or give me link how to accomplish this. please excuse my english as it is not my native language.