Issue

Ping reports missing replies even though a tcpdump shows that the replies arrived

ping -i 0 -l 700 -c 1000 10.110.1.11 > ping_results.txt;  tail -3 ping_results.txt
--- 10.110.1.11 ping statistics ---
1000 packets transmitted, 933 received, 6% packet loss, time 25ms
rtt min/avg/max/mdev = 0.211/0.533/0.898/0.152 ms, pipe 700, ipg/ewma 0.025/0.378 ms
# 

Note that the output skips from icmp_seq 659 to 708.

# sed -n -e '660,665p' ping_results.txt 
64 bytes from 10.110.1.11: icmp_seq=659 ttl=64 time=0.594 ms
64 bytes from 10.110.1.11: icmp_seq=708 ttl=64 time=0.599 ms
64 bytes from 10.110.1.11: icmp_seq=709 ttl=64 time=0.882 ms
64 bytes from 10.110.1.11: icmp_seq=710 ttl=64 time=0.898 ms
64 bytes from 10.110.1.11: icmp_seq=711 ttl=64 time=0.894 ms
64 bytes from 10.110.1.11: icmp_seq=712 ttl=64 time=0.891 ms
#

tcpdump taken on the sender shows all the missing pings

# tcpdump -B 10000 -i bond0 -w ping_test.pcap host 10.110.1.11 and icmp 
^C

# tshark -r ping_test.pcap -R "icmp.seq >= 659 && icmp.seq <= 708 && icmp.type == 0"
Running as user "root" and group "root". This could be dangerous.
1018   0.007973  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=659/37634, ttl=64
1020   0.007980  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=660/37890, ttl=64
1022   0.007987  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=661/38146, ttl=64
1023   0.007993  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=662/38402, ttl=64
1025   0.007999  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=663/38658, ttl=64
1026   0.008004  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=664/38914, ttl=64
1027   0.008009  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=665/39170, ttl=64
1029   0.008013  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=666/39426, ttl=64
1048   0.008161  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=667/39682, ttl=64
1050   0.008173  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=668/39938, ttl=64
1052   0.008180  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=669/40194, ttl=64
1053   0.008184  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=670/40450, ttl=64
1055   0.008189  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=671/40706, ttl=64
1057   0.008195  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=672/40962, ttl=64
1058   0.008200  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=673/41218, ttl=64
1060   0.008205  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=674/41474, ttl=64
1061   0.008210  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=675/41730, ttl=64
1063   0.008216  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=676/41986, ttl=64
1065   0.008231  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=677/42242, ttl=64
1067   0.008237  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=678/42498, ttl=64
1068   0.008243  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=679/42754, ttl=64
1070   0.008248  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=680/43010, ttl=64
1071   0.008253  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=681/43266, ttl=64
1072   0.008258  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=682/43522, ttl=64
1073   0.008264  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=683/43778, ttl=64
1075   0.008270  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=684/44034, ttl=64
1077   0.008275  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=685/44290, ttl=64
1078   0.008281  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=686/44546, ttl=64
1080   0.008286  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=687/44802, ttl=64
1081   0.008292  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=688/45058, ttl=64
1083   0.008297  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=689/45314, ttl=64
1084   0.008302  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=690/45570, ttl=64
1086   0.008307  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=691/45826, ttl=64
1087   0.008313  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=692/46082, ttl=64
1089   0.008319  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=693/46338, ttl=64
1091   0.008325  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=694/46594, ttl=64
1092   0.008330  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=695/46850, ttl=64
1094   0.008335  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=696/47106, ttl=64
1095   0.008341  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=697/47362, ttl=64
1097   0.008346  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=698/47618, ttl=64
1099   0.008353  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=699/47874, ttl=64
1100   0.008361  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=700/48130, ttl=64
1102   0.008367  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=701/48386, ttl=64
1103   0.008373  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=702/48642, ttl=64
1105   0.008378  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=703/48898, ttl=64
1107   0.008384  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=704/49154, ttl=64
1108   0.008389  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=705/49410, ttl=64
1110   0.008395  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=706/49666, ttl=64
1111   0.008401  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=707/49922, ttl=64
1113   0.008408  10.110.1.11 -> 10.110.1.200 98 ICMP Echo (ping) reply    id=0x8013, seq=708/50178, ttl=64
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