Are there other things to track and ban someone then just with IP? Because when someone has got a IP changer, that doesn't work.
you can use cookies on your broser to be tracted as it doesn't matter what your ip address is for those to be enabled as long as your computer saves them
There are many topics about proxies and the such, just search on the site, go to Google and type in 'proxy', apparently they have some Singaporean ones, (don't ask me, I just heard)
Those that think that using a proxy will keep them safe are sadly mistake. Just using an anonymous proxy is not the answer as even those can giev away your real IP