Thanks a lot for your help, everyone. The duplication problem was because I had Window's QoS Packet Scheduler enable. After I disabled it, I didn't see the problem any more.
-Hai --- "P.J. Malloy" <[EMAIL PROTECTED]> wrote: > Hai, > > With regards to your question about documentation > for issues with Windows > 2000, virtual adapters and duplicate packets: > > 1) We have seen this behavior on our machines, where > disabling a VPN or > other virtual adapter fixed the duplicate packet > problem. > > 2) For some additional details, see the following > FAQ for Etherpeek, which > describes the symptoms and some example virtual > adapters you might have > such as Window's QoS Packet Scheduler. Etherpeek is > a commercial software > based packet analyzer from Wild Packets. > > http://www.wildpackets.com/support/knowledge_base/etherpeek_nx#15 > > 3) When researching this issue previously, I read > additional references to > this issue on the web, though I do not recall where. > > Although this virtual adapter issue does fit the > symptoms you describe, it > is of course possible you may be seeing a separate > issue, such as the one > Eric Robinson described in his earlier reply. > > Regards, > > --PJ > > At 02:21 PM 11/25/02, you wrote: > >No, I don't think I have a VPN or any virtual > adapters > >enabled. I am now using Intel(R)PRO/100 S Desktop > >Adapter, but I still saw the problem when I used a > >different adapter (Intel 8255x Based Integrated > Fast > >Ethernet). I have two machines that have this > problem. > >I reinstalled Windows on one, and I didn't see the > >problem any more. > >Do you know any reference document talking about > this > >bug? > > > >Thanks, > >-Hai > > > >--- "P.J. Malloy" <[EMAIL PROTECTED]> wrote: > > > Hai, > > > > > > Do you have a VPN or other virtual adapters > enabled > > > on the machine? If so, > > > you may be seeing a known Microsoft NDIS bug > which > > > causes this behavior on > > > Windows 2000. > > > > > > My understanding is that the only work around is > to > > > temporarily disable the > > > VPN and possibly other virtual adapters you have > > > installed on that machine. > > > > > > Note that this is a Microsoft bug, which is why > you > > > would be seeing it even > > > when using different capture utilities. > > > > > > Regards, > > > --PJ > > > > > > At 01:53 PM 11/21/02, you wrote: > > > >Hi all, > > > >For some reasons, when I use a sniffer tool to > > > capture > > > >the network traffic on my machine (win2k > server), I > > > >always saw twice for every packet sending from > the > > > >local machine. Two packets are almost identical > > > except > > > >their timestamps are different. I used many > > > different > > > >sniffer tools (like tcpdump, ethereal, sniffer > > > basic > > > >4.5), I still saw the same problem. It happens > only > > > to > > > >the traffic orginated from the local machine, > not > > > to > > > >those that come from the other machines in the > > > local > > > >network. I can see this problem only when I run > the > > > >sniffer program on the local machine. If I run > it > > > on a > > > >different machine and capture traffic comming > from > > > my > > > >machine, I don't see the problem. So it looks > like > > > the > > > >duplicated packet doesn't go on the network, > > > otherwise > > > >I would see two of them. It's just somehow > reported > > > >twice.. > > > >Does anyone know what wrong with my machine? > Thanks > > > >for your help. > > > > > > > >-hn > > > > > > > > > > > > >__________________________________________________ > > > >Do you Yahoo!? > > > >Yahoo! Mail Plus � Powerful. Affordable. Sign > up > > > now. > > > >http://mailplus.yahoo.com > > > > > > > > > > > > > > >================================================================== > > > > This is the WinPcap users list. It is > archived at > > > > > > > > >http://www.mail-archive.com/[email protected]/ > > > > > > > > To unsubscribe use > > > > mailto: > > > > >[EMAIL PROTECTED]?body=unsubscribe > > > > > > >================================================================== > > > > > > > > > > > > > > > > >================================================================= > > > This is the WinPcap users list. It is archived > at > > > > > > > >http://www.mail-archive.com/[email protected]/ > > > > > > To unsubscribe use > > > mailto: > > > > >[EMAIL PROTECTED]?body=unsubscribe > > > > >================================================================== > > > > > >__________________________________________________ > >Do you Yahoo!? > >Yahoo! Mail Plus � Powerful. Affordable. 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