[Andrew Hood <ajhood@xxxxxxxxx>]

ronnie sahlberg wrote:
> Dulicate ACKs is an indication that packetloss has occured.
> See RFC793 or RFC1122
>
>
> On Wed, 30 Mar 2005 15:09:13 +0100, Freeman Kate F
> <KFFREEMAN@xxxxxxxxxxx> wrote:
>
> > What does one Ack and its duplicate being transmitted at the same time
> > signify?

Duplicate packets *with identical timestamps* can also be a symptom of 
Windows behaving badly. I see that trying to capture on Token Ring with 
ZoneLabs.

Whether it is Windows XP or WinPCAP or the TR drivers or ZoneLabs or 
real lost packets (the last seems unlikely since I'm seeing dup ACKs 
with the source and destination plugged into the one TR hub) I can't say 
for sure.

--
There's no point in being grown up if you can't be childish sometimes.
                -- Dr. Who