Hello, I am having some trouble with a VPN (831 Router) connectingto a 3005 Concentrator.
The User has changed ISP (Comcast to Verizon) and the 831 and 7960 IP Phone connected inside are working fine. None of the Windows PC's are working correctly. They can connect but cannot browse the Network or connect to Exchange, They get IP addresses from the 831 and can Ping servers at the head end.
Her new ISP is NATing her outside address. Her old ISP wasn't.
I am gonna take a swag at this and recommend you lower your MTU sizes on the PC's at the 831 end and try your testing again. I recommend an MTU size of 1300 or less. http://www.dslreports.com/drtcp is a good tool to easily change MTU size.
Hopefully it is a quick and easy solution, if it doesn't work, at least you have ruled out MTU.
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