Config for NAT

DNS of users computers must know server name that return your server IP so you have 2 methods to do that

Have Domain name that return same IP when you ping the domain .
Or
all computers on this wan have to have same DNS for your server

in your server you have to modify your hosts file
you will find it
C:\WINDOWS\system32\drivers\etc\

open the file with notepad

quote:

---

# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host

127.0.0.1 localhost

---

Now write a new line [for example]

9.4.8.122 servername


Thats it , i wish thats help you