Linux Ping不显示日期

我正在将ping结果保存到文件中，但有时不显示日期。我尝试了一些ping，发现接收到0个数据包时不会显示日期，但并不总是这样。我在这里复制的第一个ping有0个接收到的数据包并显示日期，最后一个没有

[jsmith@localhost ~]$ ping 192.168.100.2 -D -c 1 -I eth0
PING 192.168.100.2 (192.168.100.2) from 192.168.100.3 eth0: 56(84) bytes of data.
[1424572632.214329] From 192.168.100.3 icmp_seq=1 Destination Host Unreachable

--- 192.168.100.2 ping statistics ---
1 packets transmitted, 0 received, +1 errors, 100% packet loss, time 0ms

[jsmith@localhost ~]$ ping 192.168.100.2 -D -c 1 -I eth0
PING 192.168.100.2 (192.168.100.2) from 192.168.100.3 eth0: 56(84) bytes of data.
[1424572638.603008] 64 bytes from 192.168.100.2: icmp_seq=1 ttl=64 time=0.374 ms

--- 192.168.100.2 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.374/0.374/0.374/0.000 ms

[jsmith@localhost ~]$ ping 192.168.100.2 -D -c 1 -I eth0
PING 192.168.100.2 (192.168.100.2) from 192.168.100.3 eth0: 56(84) bytes of data.
[1424572645.153724] 64 bytes from 192.168.100.2: icmp_seq=1 ttl=64 time=0.315 ms

--- 192.168.100.2 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.315/0.315/0.315/0.000 ms

[jsmith@localhost ~]$ ping 192.168.100.2 -D -c 1 -I eth0
PING 192.168.100.2 (192.168.100.2) from 192.168.100.3 eth0: 56(84) bytes of data.

--- 192.168.100.2 ping statistics ---
1 packets transmitted, 0 received, 100% packet loss, time 0ms

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出了什么问题？

在第一次和最后一次执行中，您的答案有一个不同的解决方案：在第一种情况下，您确实收到了来自192.168.100.3的icmp数据包，告诉您192.168.100.2是不可恢复的；在后者中，没有收到数据包。