отправить ICMP ECHO_REQUEST на сетевые узлы (send ICMP ECHO_REQUEST to network hosts)
DUPLICATE AND DAMAGED PACKETS
ping will report duplicate and damaged packets. Duplicate packets
should never occur, and seem to be caused by inappropriate
link-level retransmissions. Duplicates may occur in many
situations and are rarely (if ever) a good sign, although the
presence of low levels of duplicates may not always be cause for
alarm.
Damaged packets are obviously serious cause for alarm and often
indicate broken hardware somewhere in the ping packet's path (in
the network or in the hosts).
