DUP! problem on ping

I've got the following problem when trying to ping a specific host:

64 bytes from 192.168.32.119: icmp_seq=7 ttl=128 time=0.884 ms
64 bytes from 192.168.32.119: icmp_seq=7 ttl=127 time=2.10 ms (DUP!)

I tried to get IP addresses by MAC:

root@ws100:~# ip neighbor | grep "48:5b:39:a6:c5:3a" | cut -d" " -f1
192.168.32.119

As you can see I get only one IP returned so no duplicated hosts are shown...

Is there a way how to get what's the problem?

2

1 Answer

DUP means duplicate packet.

From man ping:

 Duplicate and Damaged Packets ping will report duplicate and damaged packets. Duplicate packets should
never occur, and seem to be caused by inappropriate link-level
retransmissions. Duplicates may occur in many situations and are rarely
(if ever) a good sign, although the presence of low levels of duplicates
may not always be cause for alarm. Damaged packets are obviously serious cause for alarm and often indicate
broken hardware somewhere in the ping packet's path (in the network or in the hosts).

There are different reasons for this, did you capture your network traffic with an interface in promiscous mode? Sometimes this is the reason for dupplicated packets.

4

Your Answer

Sign up or log in

Sign up using Google Sign up using Facebook Sign up using Email and Password Submit

Post as a guest

Post Your Answer Discard

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy