# On vérifie juste qu'un ping avec -s 1300 passe normalement benjamin@debian:~$ ping 10.0.0.1 -s 1300 -c 5 PING 10.0.0.1 (10.0.0.1) 1300(1328) bytes of data. 1308 bytes from 10.0.0.1: icmp_seq=1 ttl=63 time=6.09 ms 1308 bytes from 10.0.0.1: icmp_seq=2 ttl=63 time=6.32 ms 1308 bytes from 10.0.0.1: icmp_seq=3 ttl=63 time=6.34 ms 1308 bytes from 10.0.0.1: icmp_seq=4 ttl=63 time=6.51 ms 1308 bytes from 10.0.0.1: icmp_seq=5 ttl=63 time=6.28 ms --- 10.0.0.1 ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 4006ms rtt min/avg/max/mdev = 6.090/6.308/6.509/0.134 ms # On déclenche le "bridage" # (Le serveur n'a que 1Gbits/s "burstable", et retombe à moins de 300 Mbits/s après quelques secondes) benjamin@debian:~$ iperf3 -c 10.0.0.1 -R -t 80 Connecting to host 10.0.0.1, port 5201 Reverse mode, remote host 10.0.0.1 is sending [ 5] local 172.16.0.199 port 39586 connected to 10.0.0.1 port 5201 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 73.8 MBytes 619 Mbits/sec [ 5] 1.00-2.00 sec 68.9 MBytes 578 Mbits/sec [ 5] 2.00-3.00 sec 84.8 MBytes 712 Mbits/sec [ 5] 3.00-4.00 sec 72.4 MBytes 607 Mbits/sec [ 5] 4.00-5.00 sec 62.7 MBytes 526 Mbits/sec [ 5] 5.00-6.00 sec 39.3 MBytes 330 Mbits/sec [ 5] 6.00-7.00 sec 27.1 MBytes 227 Mbits/sec [ 5] 7.00-8.00 sec 27.4 MBytes 229 Mbits/sec [ 5] 8.00-9.00 sec 23.9 MBytes 201 Mbits/sec [ 5] 9.00-10.00 sec 31.9 MBytes 268 Mbits/sec [ 5] 10.00-11.00 sec 26.4 MBytes 222 Mbits/sec [ 5] 11.00-12.00 sec 26.7 MBytes 224 Mbits/sec [ 5] 12.00-13.00 sec 23.5 MBytes 197 Mbits/sec [ 5] 13.00-14.00 sec 33.6 MBytes 282 Mbits/sec [ 5] 14.00-15.00 sec 27.9 MBytes 234 Mbits/sec [ 5] 15.00-16.00 sec 24.3 MBytes 204 Mbits/sec [ 5] 16.00-17.00 sec 28.8 MBytes 241 Mbits/sec [ 5] 17.00-18.00 sec 29.2 MBytes 245 Mbits/sec [ 5] 18.00-19.00 sec 26.1 MBytes 219 Mbits/sec [ 5] 19.00-20.00 sec 28.3 MBytes 237 Mbits/sec [ 5] 20.00-21.00 sec 28.7 MBytes 241 Mbits/sec [ 5] 21.00-22.00 sec 27.4 MBytes 230 Mbits/sec [ 5] 22.00-23.00 sec 26.8 MBytes 225 Mbits/sec [ 5] 23.00-24.00 sec 24.7 MBytes 207 Mbits/sec [ 5] 24.00-25.00 sec 30.1 MBytes 253 Mbits/sec [ 5] 25.00-26.00 sec 29.1 MBytes 244 Mbits/sec [ 5] 26.00-27.00 sec 25.3 MBytes 212 Mbits/sec [ 5] 27.00-28.00 sec 27.6 MBytes 232 Mbits/sec [ 5] 28.00-29.00 sec 29.7 MBytes 250 Mbits/sec [ 5] 29.00-30.00 sec 26.0 MBytes 218 Mbits/sec [ 5] 30.00-31.00 sec 26.8 MBytes 224 Mbits/sec [ 5] 31.00-32.00 sec 29.2 MBytes 245 Mbits/sec [ 5] 32.00-33.00 sec 27.2 MBytes 228 Mbits/sec [ 5] 33.00-34.00 sec 26.6 MBytes 223 Mbits/sec [ 5] 34.00-35.00 sec 30.4 MBytes 255 Mbits/sec [ 5] 35.00-36.00 sec 21.8 MBytes 183 Mbits/sec [ 5] 36.00-37.00 sec 33.3 MBytes 279 Mbits/sec [ 5] 37.00-38.00 sec 27.0 MBytes 227 Mbits/sec [ 5] 38.00-39.00 sec 24.9 MBytes 209 Mbits/sec [ 5] 39.00-40.00 sec 29.1 MBytes 245 Mbits/sec [ 5] 40.00-41.00 sec 28.8 MBytes 242 Mbits/sec [ 5] 41.00-42.00 sec 25.4 MBytes 213 Mbits/sec [ 5] 42.00-43.00 sec 27.8 MBytes 234 Mbits/sec [ 5] 43.00-44.00 sec 30.2 MBytes 253 Mbits/sec [ 5] 44.00-45.00 sec 25.3 MBytes 212 Mbits/sec [ 5] 45.00-46.00 sec 28.3 MBytes 238 Mbits/sec [ 5] 46.00-47.00 sec 27.8 MBytes 233 Mbits/sec [ 5] 47.00-48.00 sec 26.3 MBytes 221 Mbits/sec [ 5] 48.00-49.00 sec 27.7 MBytes 232 Mbits/sec [ 5] 49.00-50.00 sec 28.9 MBytes 243 Mbits/sec [ 5] 50.00-51.00 sec 27.2 MBytes 229 Mbits/sec [ 5] 51.00-52.00 sec 26.4 MBytes 221 Mbits/sec [ 5] 52.00-53.00 sec 28.7 MBytes 241 Mbits/sec [ 5] 53.00-54.00 sec 29.2 MBytes 245 Mbits/sec [ 5] 54.00-55.00 sec 25.5 MBytes 214 Mbits/sec [ 5] 55.00-56.00 sec 27.5 MBytes 231 Mbits/sec [ 5] 56.00-57.00 sec 30.3 MBytes 254 Mbits/sec [ 5] 57.00-58.00 sec 26.5 MBytes 223 Mbits/sec [ 5] 58.00-59.00 sec 28.0 MBytes 235 Mbits/sec [ 5] 59.00-60.00 sec 25.5 MBytes 214 Mbits/sec [ 5] 60.00-61.00 sec 27.6 MBytes 231 Mbits/sec [ 5] 61.00-62.00 sec 28.2 MBytes 237 Mbits/sec [ 5] 62.00-63.00 sec 27.5 MBytes 231 Mbits/sec [ 5] 63.00-64.00 sec 7.90 MBytes 66.2 Mbits/sec [ 5] 64.00-65.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 65.00-66.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 66.00-67.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 67.00-68.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 68.00-69.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 69.00-70.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 70.00-71.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 71.00-72.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 72.00-73.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 73.00-74.00 sec 0.00 Bytes 0.00 bits/sec [ 5] 74.00-75.00 sec 0.00 Bytes 0.00 bits/sec ^C[ 5] 75.00-75.77 sec 0.00 Bytes 0.00 bits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate [ 5] 0.00-75.77 sec 0.00 Bytes 0.00 bits/sec sender [ 5] 0.00-75.77 sec 1.93 GBytes 219 Mbits/sec receiver iperf3: interrupt - the client has terminated # Ping avec -s 1300 ne passe plus benjamin@debian:~$ ping 10.0.0.1 -s 1300 -c 5 PING 10.0.0.1 (10.0.0.1) 1300(1328) bytes of data. --- 10.0.0.1 ping statistics --- 5 packets transmitted, 0 received, 100% packet loss, time 4085ms # La limite semble être 433 benjamin@debian:~$ ping 10.0.0.1 -s 433 -c 5 PING 10.0.0.1 (10.0.0.1) 433(461) bytes of data. 441 bytes from 10.0.0.1: icmp_seq=1 ttl=63 time=5.93 ms 441 bytes from 10.0.0.1: icmp_seq=2 ttl=63 time=6.45 ms 441 bytes from 10.0.0.1: icmp_seq=3 ttl=63 time=6.26 ms 441 bytes from 10.0.0.1: icmp_seq=4 ttl=63 time=6.44 ms 441 bytes from 10.0.0.1: icmp_seq=5 ttl=63 time=6.16 ms --- 10.0.0.1 ping statistics --- 5 packets transmitted, 5 received, 0% packet loss, time 4007ms rtt min/avg/max/mdev = 5.934/6.249/6.452/0.193 ms # Extrait tcpdump de la machine serveur... # On voit bien qu'elle reçoit bien les ping quelque soit la taille, et y répond. root@dedibox:/home/benjamin# tcpdump -i ppp0 icmp tcpdump: verbose output suppressed, use -v[v]... for full protocol decode listening on ppp0, link-type LINUX_SLL (Linux cooked v1), snapshot length 262144 bytes 16:38:55.187018 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14424, seq 1, length 1308 16:38:55.187041 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14424, seq 1, length 1308 16:38:56.204525 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14424, seq 2, length 1308 16:38:56.204559 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14424, seq 2, length 1308 16:38:57.228538 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14424, seq 3, length 1308 16:38:57.228565 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14424, seq 3, length 1308 16:38:58.252566 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14424, seq 4, length 1308 16:38:58.252593 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14424, seq 4, length 1308 16:38:59.276583 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14424, seq 5, length 1308 16:38:59.276612 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14424, seq 5, length 1308 16:39:14.739325 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14425, seq 1, length 441 16:39:14.739348 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14425, seq 1, length 441 16:39:15.741844 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14425, seq 2, length 441 16:39:15.741867 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14425, seq 2, length 441 16:39:16.743372 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14425, seq 3, length 441 16:39:16.743395 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14425, seq 3, length 441 16:39:17.744887 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14425, seq 4, length 441 16:39:17.744910 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14425, seq 4, length 441 16:39:18.746157 IP 10.0.0.10 > 10.0.0.1: ICMP echo request, id 14425, seq 5, length 441 16:39:18.746187 IP 10.0.0.1 > 10.0.0.10: ICMP echo reply, id 14425, seq 5, length 441 ^C 20 packets captured 20 packets received by filter 0 packets dropped by kernel