Ping found DUP!

Dear All,

I work at ISP, i work as communication Engineer. We provided internet service to customers. One of our client complained about Duplicate packet received during ping.
Can anyone tell me why is this happending and how this problem can be solved?

64 bytes from 192.168.11.6: icmp_seq=8 ttl=64 time=53.1 ms
64 bytes from 192.168.11.6: icmp_seq=8 ttl=64 time=88.0 ms (DUP!)

Waiting 4 ur replies....

Your new fren
Manoj

Some packets are 'duplicated' when the client receives a particular
packet twice. This happens when ACK from the client for successfully receives packet 'is lost' and does not reach the server. This is deduced from: Client capture - client receives the same packet twice. Server capture - retransmit after no ACK for the particular packet is received (RTO). So on the server side this is 'not marked as lost packet' because in actual it is not. On the client side, this will be 'marked as duplicated packet' since it is. Not sure how you can fix that but hope that helps a friend of mine told me how that happens but not how to fix it.

ill look into it a lil bit more.

Thankx for the reply.
One of my friend said that it is found in MAC Computer. So, where is the fault? is that on client side or in Server?
Why is sucessful received packet lost and dont get ACK by the server?
Hoping to have a quick reply from you all...

Manoj