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yes if its on the third nic then that means that its mostly a DMZ and you would have no need of going to it because its for your own protection. Thats what they are there for, but yes if you wanted to get access to that webserver a few iptables rules will let you have access to it.
eth0 = 188.8.131.52 (1st NIC) - this card going out to internet (EXTERNALIF)
eth1 = 192.168.1.251 (2nd NIC) - this card is for LAN (DHCP)
eth2 = 184.108.40.206 (3rd NIC) - this is for DMZ (for server farm)
And 220.127.116.11 is ip address for the web server that i put it in the same vlan and same range with the 3rd card.
unfortunately, yesterday we changed the firewall tu win2k server, it's a direction from my it administrator from the center. recently i'm a little bz with the conversation process. can karunesh give me your mail, i'll provide to you the iptables rules...