We have a VPN setup to four remote locations and a corporate office. The office network is a 10.x.x.x network. The four remote locations are subnets 10.6.x.x, 10.7.x.x, 10.8.x.x, and 10.9.x.x. They are connected via Cisco routers, an 1841 Series at the corporate office and 861 Series at the remote location. In the past we had an ISA firewall that was removed when we took out a SBS 2003 server. As of now, we have an IPCop in its place. The remote networks are able to ping the server behind the IPCop firewall, at 10.0.0.2. They are unable to access any network resources. When we ran a traceroute to the server, it seemed to get stopped at the outside interface of the IPCop. After allowing ICMP traffic through the IPCop, we were able to get to the server with our ping requests.
While being able to ping the servers and other network resources is nice, we need to be able to access these resources. Not sure what protocols or rules to add at this point. Any suggestions?