Why did ping work but any other connection fail in the following scenario?
We have the following network scenario: 2 Offices each with a Sonicwall NSA 3500 Each office has it's own network, with a unique subnet A:(192.168.10.X/24) and B:(192.168.20.X/24) A single VPN configured between the offices
Problem: An application client running on a system in network A couldn't connect to server on network B.
Tests: First tried ping, successful. Then tried telnet to port of app, failed. So logically, we thought there was a firewall rule blocking that port. But that wasn't it...
Solution: The problem actually was the default gateway was not correctly set on server B. Once we set that correctly the connection from network A to network B worked.
So how could ping work, even though the default gateway of the destination system was wrong? Shouldn't it have failed?
Oh, the client system was 2008R2 and server was a network appliance PTX
Thanks for your time.