After commad route -f all routes will be removed.
To restore loopback adapter rotes use this commands :
route add 127.0.0.0 mask 255.0.0.0 0.0.0.0 metric 306 if 1
route add 127.0.0.1 mask 255.255.255.255 0.0.0.0 metric 306 if 1
route add 255.255.255.255 mask 255.255.255.255 0.0.0.0 metric 306 if 1
To restore loopback adapter rotes use this commands :
route add 127.0.0.0 mask 255.0.0.0 0.0.0.0 metric 306 if 1
route add 127.0.0.1 mask 255.255.255.255 0.0.0.0 metric 306 if 1
route add 255.255.255.255 mask 255.255.255.255 0.0.0.0 metric 306 if 1