[Winpcap-users] rate limitation

MARMONIER Cédric cmarmonier at ifotec.com
Fri Sep 23 06:48:16 PDT 2011

If I set my Ethernet Card in 1Gb mode, there is always the problem but if I
configure my Ethernet Card in 100Mb/Full-Duplex, there is no problem (I send
an 100Mb flow): it is very strange.
When I am in 1Gb mmode, I can't choose the duplex mode.
=> My Ethernet Card is Realtek RTL8168C : I updated the driver with the last

-----Message d'origine-----
De : winpcap-users-bounces at winpcap.org
[mailto:winpcap-users-bounces at winpcap.org] De la part de Mark Pizzolato -
Envoyé : mercredi 21 septembre 2011 03:33
À : winpcap-users at winpcap.org
Objet : Re: [Winpcap-users] rate limitation

On Tuesday, September 20, 2011 at 6:27 PM, "Fish" (David B. Trout) wrote:
> MARMONIER Cédric wrote:
> [...]
> > But when I connect my PC to a Gigabit  Ethernet switch (D-LINK
> > DGS-1008D), my PC send a 45Mb flow : it isn't the switch which drop
> > packets but the function sendpacket() which run slower (no packets are
> > lost).
> >
> > Do you know why ?
> This does not sound like a WinPCap problem.
> This sounds like a hardware problem.
> Try a different switch.

I agree it is likely a hardware problem.  It may be an incompatibility
between the NIC and switch's ability to 'auto detect' the Link Speed and
Duplex.  You can try to 'hard set' the Link speed to 1Gb and Duplex to Half
and then Duplex to Full and see if this changes your results.

Good Luck.

- Mark Pizzolato


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