you just need to forward 1 Port and this is 34297 in default.
You forwared it to 192.168.2.1, is that the ip from the machine running the dedicated server?
Go to the machine on which the server should run, press
windowskesy + r
type cmd enter
in the commandline box type
ipconfig
see what ip you have.
I think its something like 192.168.2.xxx but not 192.168.2.1 which is propably the ip of your router / gateway.
if you have the ip, forward 34297 TCP to this ip.
start the server, check the checkbox "matchmaker announce" if you want to make it visible in the lobby and in your client select "game refresh local" instead of "internet" and then refresh the lobby.
TBH: This is the wrong forum!
This is the rFactor2 Forum, you should rather place it to one of the rf1 or technical forums, cause rf2 server might be different.