the cisco vpn client has a check box to allow access to local area network. The setting is on the Transport tab when you are looking at the properties of the connection.
If you want to access other things than on your local area network, you are going to have to ask your client to enable split dns and split connection(I think that is what it is called) otherwise the cisco client has a builtin firewall which basically disables access to anything but the network to which you are connected.
The local LAN setting is on your client software, everything else is on the cisco device which you are connecting to.