i could not find any duplicate packets in that trace so you dont
have that particular issue.
you do have a serious issue with packetloss and tcp retransmissions though.
(select one of the retransmissions and select
Statistics/tcpstreamgraph/stevens...
see the almost parallell lines when the sequence number is increasing?
this looks like what you have if you
1, have a duplex mismatch
or
2, multilink but one link is silently dead
or
3, you push a slow slow serial link such as gprs too hard
If 3 is the case maybe you can enable some sort of flow control or
packetshaping to reduce the pace at which you send data to eliminate
overdriving the link and causing frameloss?
On 6/7/06, Muzalina Zakaria <muzalina_zakaria@xxxxxxxxx> wrote:
Hi,
I have Zone Alarm (free version) on both server and client. All settings are
ok.
On server, the network card is D-Link DFE-538TX 10/100 adapter and appeared
to be in the latest driver version for this particular model. It is
connected to ADSL modem.
On client, USB port.
If the captures were captured twice, I should be seeing 'double packets'
from the same source/direction with different timestamps?
Please take a look at my sample capture here:
www.darikawan.com
at the bottom left corner Download Here section. I hope this is acceptable
to ethereal community? I cannot put the sample in the server because this is
a private server.
Thanks.
BV
ronnie sahlberg <ronniesahlberg@xxxxxxxxx> wrote: please check if you have a
firewall software installed on the box you are capturing from.
Some people has seen interaction between for example blackice and winpcap
causing the captures to be captured "twice" for some mysterious reason.
On 6/7/06, Becky Vict <becky_vict@xxxxxxxxx> wrote: Hello there,
Thanks for your tip. I will look into my hardware versions and firewall
setting.
Could it be possible that the problem come from the 'internet cloud' between
my server and client?
Do you have the thread of the earlier discussion on this or the topic (I
can search ethereal archive)?
Thanks.
BV
Andrew Hood < ajhood@xxxxxxxxx> wrote: Becky Vict wrote:
> Hello ethereal community.
>
> I need help in explaining the capture I get. I'm downloading a file from
> an FTP server and I'm noticing a weird thing which is - in the exact
> same timestamp I get data packet transmission from server and a dupack
> from client. In another instance, out-of-order from server is followed
> by dupack from client also in the same timestamp. And another instance
> which is even worse, TCP segment lost is followed by dupack and then
> retransmission all happening in the same timestamp
> (server-client-server). Even TCP window update comes in two, coming
> twice from client in the same timestamp (is this duplicated packet?)
>
> How is this possible? Is there something wrong?
>
> I'm using ethereal V 0.10.13 and winpcap 3.1.
> OS is XP Pro SP 1 both client and server.
>
> I hope I have given a clear picture of my problem.
>
> Thank you in advance.
This was discussed at length some time back. It might help if you said
what hardware you are using.
You are almost certainly seeing an interaction between parts of the
network stack causing packets to go past the point where winpcap
collects them twice.
Check you have the latest version of the driver for your network card.
That fixed it for me. (ThinkPad T40, Intel PRO/1000 MT)
It may also be caused by Windows firewall/connection sharing. Fiddling
wiht that fixed it for some others.
--
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-- Dr. Who
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