My latest trick for deciding on external ports to forward is to combine the service port and the device's internal IP address. If my desktop was 10.0.1.36 and t

My latest trick for deciding on external ports to forward is to combine the service port and the device's internal IP address. If my desktop was 10.0.1.36 and the service was SSH on port 22, the external port would be 22136. So far it's worked well, but it only really works if you force your router to only give out 10.0.1.2 through 10.0.1.99.