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[root@localhost student]# ping 10.255.240.104
PING 10.255.240.104 (10.255.240.104) 56(84) bytes of data.
64 bytes from 10.255.240.104: icmp_seq=1 ttl=64 time=0.283 ms
64 bytes from 10.255.240.104: icmp_seq=2 ttl=64 time=0.272 ms
64 bytes from 10.255.240.104: icmp_seq=3 ttl=64 time=0.271 ms
64 bytes from 10.255.240.104: icmp_seq=4 ttl=64 time=0.272 ms
64 bytes from 10.255.240.104: icmp_seq=5 ttl=64 time=0.284 ms
It isn't a loss. Running ping with -f causes flood ping. All those dots mean something. From the ping man page:
-f Flood ping. For every ECHO_REQUEST sent a period ``.'' is
printed, while for ever ECHO_REPLY received a backspace is
printed. This provides a rapid display of how many packets are
being dropped. If interval is not given, it sets interval to
zero and outputs packets as fast as they come back or one hun-
dred times per second, whichever is more. Only the super-user
may use this option with zero interval.