sorry bout that i forgot something ...
to connect from LAN you need to edit your host
go to C:\WINDOWS\system32\drivers\etc folder
then edit the host (open it in notepad)
put your LAN IP then your WAN IP below the 127.0.0.1 localhost
heres the sample
Code:
# 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
192.168.2.156 WAN IP
you need to edit both host in your pc (server) and your dad's pc
make sure the LAN IP you use is your server LAN IP
hope it works now for you :