PPTP SERVER 如何增強保安或防止撞密碼？

ethan590

近日發現大陸IP時不時連接ＰＰＴＰ。　如何增強保安或防止撞密碼？

23:12:42 pptp,info TCP connection established from 42.120.84.11
23:12:43 pptp,info TCP connection established from 42.120.84.228