Hello, Nickolay
run "tcpdump icmp -n" and ping
Thank you very much. I ran "tcpdump icmp -n" 2 times and then get the
following result.
(1)the first time:
------------------------------------------------
message of host:
----------------------------------------------
19:50:23.759123 192.168.0.198 > 192.168.0.59: icmp: echo request
19:50:23.759297 192.168.0.59 > 192.168.0.198: icmp: echo reply
19:50:31.201261 192.168.0.198 > 192.168.0.59: icmp: echo request
19:50:31.201319 192.168.0.59 > 192.168.0.198: icmp: echo reply
19:50:38.572536 192.168.0.198 > 192.168.0.59: icmp: echo request
19:50:38.572619 192.168.0.59 > 192.168.0.198: icmp: echo reply
19:50:45.890345 192.168.0.198 > 192.168.0.59: icmp: echo request
19:50:45.890428 192.168.0.59 > 192.168.0.198: icmp: echo reply
19:51:00.333976 192.168.0.198 > 192.168.0.59: icmp: echo request
19:51:00.334057 192.168.0.59 > 192.168.0.198: icmp: echo reply
19:51:14.777603 192.168.0.198 > 192.168.0.59: icmp: echo request
19:51:14.777691 192.168.0.59 > 192.168.0.198: icmp: echo reply
19:51:29.221228 192.168.0.198 > 192.168.0.59: icmp: echo request
19:51:43.664851 192.168.0.198 > 192.168.0.59: icmp: echo request
19:51:58.108477 192.168.0.198 > 192.168.0.59: icmp: echo request
19:52:12.552102 192.168.0.198 > 192.168.0.59: icmp: echo request
----------------------------------------------------------
while the target output following message:
------------------------------------------
PING - received 3 of 10 expected.
(2)the second time:
----------------------------------------------------
message of host:
--------------------------------------------------
19:54:37.019363 192.168.0.198 > 192.168.0.59: icmp: echo request
19:54:51.462989 192.168.0.198 > 192.168.0.59: icmp: echo request
19:55:05.906613 192.168.0.198 > 192.168.0.59: icmp: echo request
19:55:20.350239 192.168.0.198 > 192.168.0.59: icmp: echo request
19:55:34.793867 192.168.0.198 > 192.168.0.59: icmp: echo request
19:55:49.237488 192.168.0.198 > 192.168.0.59: icmp: echo request
19:56:03.681114 192.168.0.198 > 192.168.0.59: icmp: echo request
19:56:18.124738 192.168.0.198 > 192.168.0.59: icmp: echo request
19:56:32.568365 192.168.0.198 > 192.168.0.59: icmp: echo request
19:56:47.011988 192.168.0.198 > 192.168.0.59: icmp: echo request
-------------------------------------------------------
while the target output:
---------------------------------------------------
PING - received 0 of 10 expected.
the host has received request but why not send reply?
Looking forward to your further advice.