can't ping SQL server or connect to SQL server when using server name

I have SQL server running on a legacy Windows 2003 box on IP address 192.168.2.240. There seems to be a reference to the server with some old connection strings for a web application. I'm merely using it for comparison purposes because we just upgraded to Windows Server 2008, .NET 4.0 and Enterprise Library 5.0. The server is referenced with "SQL01" not the IP address. On the network where this IP address resides, I can ping "SQL01", but when I VPN to that network, I cannot. Why wouldn't this work over a VPN? This is a legacy server, and I don't know how it was setup. If anyone can explain where this name is configured, and how I can connect (or ping) "SQL01" instead of using the IP address, I'd like to be开发者_开发知识库 enlightened.

Try looking in your hosts file.