I have a few questions about the Port Forwarding and routers in general. I have changed the actual port numbers on the picture below to maintan privacy and security (but this was probably unnecessary, right?).
As you can see on the picture below, the internal and external UDP and TCP ports have the same number in my router settings for Skype. But in Skype, under the Connections, I have a different port number (6677). Should I change and enter the number that I've found under the UPnP settings of my router to make Skype work better?
I am pretty new to networks but it seems to me that even though the UPnP is enabled in my router Skype didn't get set up properly - as the port numbers differ. Or am I wrong?
Also, why is the number after the IP address :5698 and the port's numbers are 56985 (with the additional number 5)? What's the deal here, which port is opened then, 5698 or 56985?
Would my internet connection be (much) more secure if I would disable the UPnP completely and open the ports for Skype manually (if yes - how & do I have to do it for each computer on the network respectively)?
In general, is it true that one should always open only the ports above 6000 (for Skype and such)?
A little off topic: how can I check which Channel is best for my WiFi broadcast? Is there a (free) utility that would find the best possible channel for my wireless network? Or should I leave it on the Auto setting?
Thank you for your help in advance!