Alors deux truc marrant :
Mac-Arty:~ yblazart$ ping -D -s 1500
www.google.frPING
www.google.fr (216.58.213.99): 1500 data bytes
ping: sendto: Message too long
ping: sendto: Message too long
Request timeout for icmp_seq 0
ping: sendto: Message too long
Request timeout for icmp_seq 1
ping: sendto: Message too long
Request timeout for icmp_seq 2
ping: sendto: Message too long
Request timeout for icmp_seq 3
PING
www.google.fr (216.58.213.99): 528 data bytes
72 bytes from 216.58.213.99: icmp_seq=0 ttl=53 time=15.346 ms
wrong total length 92 instead of 556
72 bytes from 216.58.213.99: icmp_seq=1 ttl=53 time=14.035 ms
wrong total length 92 instead of 556
72 bytes from 216.58.213.99: icmp_seq=2 ttl=53 time=14.051 ms
wrong total length 92 instead of 556
72 bytes from 216.58.213.99: icmp_seq=3 ttl=53 time=14.032 ms
wrong total length 92 instead of 556
72 bytes from 216.58.213.99: icmp_seq=4 ttl=53 time=13.293 ms
wrong total length 92 instead of 556
72 bytes from 216.58.213.99: icmp_seq=5 ttl=53 time=14.555 ms
wrong total length 92 instead of 556
mais a vide :
Mac-Arty:~ yblazart$ ping
www.google.frPING
www.google.fr (216.58.213.99): 56 data bytes
64 bytes from 216.58.213.99: icmp_seq=0 ttl=53 time=12.967 ms
64 bytes from 216.58.213.99: icmp_seq=1 ttl=53 time=14.747 ms
64 bytes from 216.58.213.99: icmp_seq=2 ttl=53 time=12.442 ms
64 bytes from 216.58.213.99: icmp_seq=3 ttl=53 time=13.274 ms
64 bytes from 216.58.213.99: icmp_seq=4 ttl=53 time=12.707 ms
64 bytes from 216.58.213.99: icmp_seq=5 ttl=53 time=13.465 ms
comprends pas tout