Wireshark-users: Re: [Wireshark-users] 8-10% packet error/loss is normal wired network?
Date: Tue, 10 Jul 2012 06:57:13 -0700
No, 8 to 10% is not normal, but your display filter is grossly over-counting the packet loss. To start with, by showing both the packet with the "previous segment lost" message and also the retransmission, you're counting each lost packet twice. And then, a single lost packet requires at least three duplicate ACKs before a fast retransmission is generated.

Try filtering on retransmissions only. This will give you a more accurate count of lost packets. By the way, tcp.analysis.retransmission includes fast retransmissions, so you don't have to include tcp.analysis.fast_retransmission as a separate display filter condition.

----- Reply message -----
From: "Flako" <[email protected]>
To: <[email protected]>
Subject: [Wireshark-users] 8-10% packet error/loss is normal wired network?
Date: Tue, Jul 10, 2012 6:04 AM

     I am analyzing the network with wireshark :) and found 8-10% of lost packets (filter: malformed | | tcp.analysis.lost_segment | | tcp.analysis.retransmission | | tcp.analysis.fast_retransmission | | tcp.analysis.duplicate_ack ) between various Linux desktop and an HP 2420n (network printer)

     The printer is connected to switch A (100Mbit) and dektop are connected to the switch B (1Gbit), where A and B swich are interconnected.
     The printer was replaced (otherwise error) and the new printer keeps happening the same.
     I can only see wiring issues.

     On if my question is if this% is "normal" (hard word) in a wired network scheme (it seems to me much)
     Is there any way to look at something else, to know that it also occurs to a statistic on the filter showing up?

   Thanks for reading. and sorry for using google translate.