hello, i'm using win xp sp2, and i was wondering if there's a way to share my internet connection ( pppoe ) not by IPs but by vpn accounts. I allowed incoming connections and everything is working fine but i don't want anybody to be able to use my connection without logging in. The thing is if i enable internet sharing, a lot of people can spoof IPs and use my connection. So is there a way to enable internet sharing just over VPN ?

Internet sharing is for connecting networked pcs to the internet without buying a router. Internet sharing is a local to internet configuration. Who on your local net will be spoofing ips? I think you are confusing what is outgoing to the internet and what is incoming from the internet. For example are you using VPN's on your lan? Give a person a fish, they eat for a day. Suggest they internet search and they learn a skill for a lifetime.