Question : Problem: File Replication accross WAN link

Scenario:

We have two sites connected via static VPN link over a T1 WAN connection. Site "A" is the corporate office which has the main file server where we have the file store for the organization. This site also maintains the Windows 2003 domain. Site 'B" is a field office with no local domain controller or file storage of their own. When they log into the network, they are doing so from our domain controllers. We prefer that site "B" uses site "A" file server to work from and store the production work files as this location has the backup services.

Problem:

The connection is slow from site "B" to site "A"s file server. Navigating the directory structure is difficult at best. They normally copy files locally to work from which causes problems when they copy them back because we have multiple users working on the same projects. Over writes are a major concern.

Solutions? What we need to accomplish is to have the file structure replicated at both sites. If someone opens a file on either replicated server, it locks the other file out as "read only". We are already planning on integrating another DC at site "B" to enhance network response times for Internet browsing, logon and print services.

How is this best accomplished? Would DFS help to some extent?

Answer : Problem: File Replication accross WAN link

Cisco has two versions, network modules and standalone appliances.  The network modules are very cost effective because they install in your router and do not have any maintenance costs over and above what you are paying for your router.  Unfortunatly, my little bit of research says they don't work with your routers.  So, you need the appliances.  And, you need 3 to run which is one for each site and then a central manager.  I'd conatct the various vendors, or your VAR, and get specs and quotes.  If they can make it affordable, it is a wonderful solution.