Plex-Time Capsulee Fastweb

Hello I'm Bruno, I'm stuck with this problem ...:
I have a Hug fastweb with a public IP even though the modem gives me an ip range 198.162.1.254,
I have a time capsule connected to the modem Fastweb, I connected to the TC via the LAN ATV3, the Mac, and sky, with the wi-fi TC sailed with other wireless devices, until I had the telephone operator was all ok , now I had to change IP in the file setting.py of plex Connect I have installed on the Mac, I've tried everything, what I have to put ip? What modem 198.162.1.254?, That of the CT type 10.0.1.1, I tried them all but nothing, when I go to ATV3 and trailer I part the original app and I do not see my Mac
Where am I doing wrong?
Thanks for your help and greetings to all

Do not edit settings.py and use the official install guides on our wiki.
Please read the “read before posting” sticky and provide all the requested information that is needed to help troubleshoot your issue if you still have issues.