I am pre-paring for a network upgrade of both infrastructure and bandwidth. We will be implementing a site-to-site VPN network for 30 locations. Most of the remote locations are small and only have up to 5 users at a time. Eight of the locations are larger with 20-75 users at each.
Currently we have Cisco site-to-site VPN's for the larger eight locations. Each site's router is doing the DHCP for the end users. All end users regardless of location are currently using the corporate DNS server.
Main Location - 192.168.2.0
Large Location 1 - 192.168.1.0
Large Location 2 - 192.168.3.0
Large Location 4 - 192.168.4.0
Large Location 5 - 192.168.5.0
Large Location 6 - 192.168.6.0
Large Location 7 - 192.168.7.0
Corporate DNS is on 192.168.2.0/24 network.
In terms of network infrastructure all sites will have SonicWall NSA240 and three of the larger sites will have NSA2400's. All sites traffic will route to our corporate building (currently the 192.168.2.0/24 network) and route all internet traffic out of the NSA2400. The sonicwalls will be setup so all traffic is allowed to all networks (Full Mesh VPN)
I am looking to have all users and end devices on the same subnet, however I am looking for some advice on how to setup the IP Schema. Essentially I would like to have all end users get DHCP/DNS from the coproporate office. The DHCP server is a Windows Server 2003.