Pour que ping affiche les trames qu'il n'a pas reçu, utiliser la commande ping -DO @IP :
[1437661145.171391] 1008 bytes from 147.173.3.254: icmp_seq=156 ttl=64 time=0.369 ms
[1437661146.171434] 1008 bytes from 147.173.3.254: icmp_seq=157 ttl=64 time=0.342 ms
[1437661148.170942] no answer yet for icmp_seq=158
[1437661149.170995] no answer yet for icmp_seq=159
[1437661149.171354] 1008 bytes from 147.173.3.254: icmp_seq=160 ttl=64 time=0.299 ms
[1437661150.171494] 1008 bytes from 147.173.3.254: icmp_seq=161 ttl=64 time=0.399 ms
[1437661151.171398] 1008 bytes from 147.173.3.254: icmp_seq=162 ttl=64 time=0.331 ms

Cette option est disponible dans les iputils-s20121221 et suivantes.