Round trip time display of ping is incorrect.

Solution Verified - Updated -

Issue

  • When ping command is executed on guest OS, displayed round trip time is incorrect.
  • According to data by tcpdump, the response of ping is not late.
  • Could you please let us know the cause and the action to be taken of this issue?
# date; time ping -c 30 <IP Address>
Wed Apr 10 15:15:46 JST 2013
PING <IP Address> (<IP Address>) 56(84) bytes of data.
64 bytes from <IP Address>: icmp_seq=1 ttl=255 time=35764 ms
64 bytes from <IP Address>: icmp_seq=2 ttl=255 time=35764 ms
64 bytes from <IP Address>: icmp_seq=3 ttl=255 time=35762 ms
...
64 bytes from <IP Address>: icmp_seq=28 ttl=255 time=35764 ms
64 bytes from <IP Address>: icmp_seq=29 ttl=255 time=35763 ms
64 bytes from <IP Address>: icmp_seq=30 ttl=255 time=35767 ms

--- <IP Address> ping statistics ---
30 packets transmitted, 30 received, 0% packet loss, time 29000ms
rtt min/avg/max/mdev = 35762.067/35764.409/35778.059/4.330 ms

real    0m29.009s
user    0m0.001s
sys     0m0.003s
<tcpdump>
>15:16:22.538318 IP <IP Address> > <IP Address>: ICMP echo request, id 41238, seq 1, length 64
>15:16:22.539217 IP <IP Address> > 10.224.240.161: ICMP echo reply, id 41238, seq 1, length 64
>15:16:23.535995 IP <IP Address> > <IP Address>: ICMP echo request, id 41238, seq 2, length 64
>15:16:23.539490 IP <IP Address> > <IP Address>: ICMP echo reply, id 41238, seq 2, length 64
>15:16:24.535997 IP <IP Address> > <IP Address>: ICMP echo request, id 41238, seq 3, length 64
>15:16:24.537224 IP <IP Address> > <IP Address>: ICMP echo reply, id 41238, seq 3, length 64

Environment

  • Red Hat Enterprise Linux 5 Update 9
  • Architecture: x86_64
  • Kernel Version: kernel-2.6.18-164.9.1.el5.x86_64
  • Package Version: iputils-20020927-46.el5.x86_64

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