We are in the process of encompassing a small company X into company Y. Company X has a ISP managed router and a firewall plus 16 servers. Company X also connects to another location via site to site VPN connection. It has a single flat VLAN. We will be migrating company X network into Y. During the initial phase it will share the same physical premises but will be treated as a separate network. Two things that company X will need is access to the internet and an acess to a remote location from company's Y network. I am totaly new to this scenario and have not done something like this past. I am looking for any direction or links where there are case studies on merging two different companies network or any kind of resources will be apprecaited.