LongDongSilver i see the problem now.. you have DS-Lite, you don't have a "real" public ipv4 address, just an ipv6 one. Since pluto does not support ipv6 it's not possible for you to host servers at home.
I was in a similar situation a few years ago (same provider) and the only way to get around that is to buy a separate router that you put behind your cable modem and then switch to "bridge mode" on the provider's web panel (you have to login on their website to access that, it's not a modem setting).