[Winpcap-users] rate limitation

[Black, Michael (IS)]

Hmmm..Realtek's doc indicates 8168 should support full duplex at 1Gb.

So perhaps your switch doesn't support full duplex at 1Gb.

What switch are you plugged in to?



Options Description
Auto Negotiation        Auto negotiation the supported link speed and duplex mode with connected device. (default)
10Mbps/Half Duplex      Set link speed and duplex mode to 10Mbps/Half Duplex.
10Mbps/Full Duplex      Set link speed and duplex mode to 10Mbps/Full Duplex.
100Mbps/Half Duplex     Set link speed and duplex mode to 100Mbps/Half Duplex.
100Mbps/Full Duplex     Set link speed and duplex mode to 100Mbps/Full Duplex.
1000Mbps/Full Duplex    Set link speed and duplex mode to 1000Mbps/Full Duplex. (*)
[cid:D8FB672-CE92-40944-8707-E83231C502 at MimeCtl]        NOTE: (*) RTL8101E, RTL8102E and RTL8139 series NIC only support 10/100 Mbps.



Michael D. Black

Senior Scientist

NG Information Systems

Advanced Analytics Directorate



________________________________
From: winpcap-users-bounces at winpcap.org [winpcap-users-bounces at winpcap.org] on behalf of MARMONIER Cédric [cmarmonier at ifotec.com]
Sent: Friday, September 23, 2011 8:48 AM
To: winpcap-users at winpcap.org
Subject: EXT :Re: [Winpcap-users] rate limitation

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
version



-----Message d'origine-----
De : winpcap-users-bounces at winpcap.org
[mailto:winpcap-users-bounces at winpcap.org] De la part de Mark Pizzolato -
WinPCap-Users
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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