This is all kind of linked to banning people by their IP address! It seems impossible to do much if a user has a Dynamic IP address without banning someone else, is this correct or are there ways of controlling em?
Also do ISP's that use static IP address's give each of their users a unique IP address or is it possible for them to give two of their users the same address, do they ever do this?
Probably basic stuff but I just wanna be sure of what I'm doing
two computers cannot have the same IP address at the same time. most users have an assigned IP (as opposed to a static one), so if that IP expires, they may be given a different one.