Ip configuration changed by service NAT over Xserver

[Hosky]

Hi I am new in this forum,

I have an old Xserver in the school and I am installing lion server in a new hard drive. It has 2 Nic's. After made the nic and services (DNS, DHCP, etc.) configurations on the server, I start to get up the services but when the server NAT start to work the ip address over the LAN change to 192.168.2.1(Ifconfig) but I can see on Server app the real address even on Network Preferences and the DHCP server start to supply the address over this range (192.168.2.XXX). If somme one has an idea, please I will appreciate that.

Thanks