Thanks for your kind reply..
I always found an example of iptables rules for its network configuration using only one static ip which is for eth0. And for the Trusted Internal Network and for the DMZ, they always using ip that is in the same network segment. But, in my department, I've one proxy server which have ip configurations like this :
eth0 = Wan_ip = 188.8.131.52
eth1 = Lan_ip = 192.168.1.251
eth2 = DMZ_ip = 184.108.40.206 (this is what i mean of static ip, Which my department get a block of ip 220.127.116.11-255 from our ISP - whic will be used for our server farm, for example, web server = 18.104.22.168, DNS Server = 22.214.171.124, Mail Server = 126.96.36.199 )
Is my ip configuration can used the same rules in iptable????