Eu usei 3proxy .
Meu config.txt
auth iponly
allow * * 83.221.199.178 80
parent 1000 tcp 192.168.1.5 8080
# redirect requests for 83.221.199.178:80 to 192.168.1.5:8080
allow *
proxy
# transparent for other requests
# default proxy port is 3128
# you can change it adding
#proxy -p8000
Eu instalei o 3proxy como um serviço com 3proxy.exe --install config.txt
.