[Flako <subforos@xxxxxxxxx>]

Hello
 I found the option of the printer to set the negotiation, set it to auto and now does not lose packets via ICMP (from desktopA to the printer).

 I also verify that setting autonegotiation = not in the printer, the switch is set as Half-duplex.

 I went back to configure the network as before.
 
switch B (1GB) <---> switch A (100Mb)  -----> Printer

                        | 
                        |  ---> Desktop Z, X, Y

                        |   
                        | ---> Some desktop and server



 Now "tcp.analysis.retransmission" the desktop Z, has a loss of 0.25%, while desktop Y, X has a 0.9%

 I guess that 0.9% should remain much .. but I think I'll leave.

 I thank you all the writing in this post, I really learned what I owe to you.

 Greetings.

2012/7/14 Flako <subforos@xxxxxxxxx>

It goes back, I see wrong from gmail

Now they are connected as (new sniffer are with this structure)

switch B (1GB) <-> switch A (100Mb) <-> switch C (100Mb) ---> Desktop Z
                       |                                         |                                    | -----> Printer
                       |                                         |
                       |                                         | -> Some desktop Y
                       | -> Some desktop and server