how to judge an IP is an indepedent true Internet IP?
 

I am sure my remote serer's IP is a true Internnet IP (from 1 ISP),
however I am not sure another IP (from another ISP)
I use at my local LAN is not
a true Internet IP, since looks like I cannot control most of
aspects, like open and close specific ports? Mybe what they gave me is
not a true IP, but share with orthers? At my local LAN, I am using
VDSL for internet access, and I am using squid for internet sharing
inside my LAN

Thx,
HTM

ummm your paragraph is kind of confusing, I can barely understand what you're asking for. Ask a moderator to have this post moved to networking.