This blog post introduces one of the major networking wizards “Connect to the Internet Wizard (CTIW)” in SBS 2008 and gives some insight on how setup handles networking.
The job of the CTIW is to detect a third party firewall device or ISA server and an existing DHCP server, while trying to gather information about the current network settings so it can properly configure the server to communicate with the Internet. This is only a small part of what the CEICW did in SBS 2003. Public domain name, certificate, and Exchange configuration are done using other wizards.
To first understand how the CTIW works, you must first be aware of the networking requirements of SBS 2008 and understand what steps are occurring during setup to configure the network connection of the server. Whether or not you need to run the CTIW depends directly on a successful networking configuration performed by setup.