I understand that you are having some issues in order to set up your Slingbox for Internet Viewing since you have a new router.
Unfortunately, you did not provide any information (specific make and model) about your router. In this case, I recommend you to check the following link in order to determine if our guide helps you to get the step-by-step instructions for your router model:
If it does not help you, I encourage you to reply back and make sure to provide the specific make and model for your router. This way, other forum users will provide you with accurate responses.