3 offices, 2 have the 861 and one has the 881. All offices are able to map drives and connect to each other. I'm having a problem w/ a Riverbed appliance and have been troubleshooting w/ them and they claim the problem is in my network. When I try to ping a router from one office to the other it times out. I've tried it from the Command Prompt and the ping tool in the routers. Clients that are in the same office can ping the router in that office but not any router outside of that office.......I can ping a server in another office and it completes.