dans rfi.bat :
netsh interface ip set address name="Local Area Connection" static 172.16.238.249 255.255.255.0 172.16.238.252 1
netsh interface ip set dns "Local Area Connection" static 172.16.238.5

dans maison.bat :
netsh interface ip set dns "Local Area Connection" dhcp
netsh interface ip set dns "Local Area Connection" static 194.2.0.20