[Winpcap-users] winpcap captures packet, but winsock doesn't see it

Gianluca Varenni gianluca.varenni at cacetech.com
Wed Jan 7 19:41:59 GMT 2009

It's definitely not a NIC issue. The TCP/IP protocol driver is rejecting 
that packet for some reason that doesn't come to my mind at the moment.

What is the MAC src and destination addresses that you are using?


----- Original Message ----- 
From: "Coleman Brumley" <coleman.brumley at jandasoft.biz>
To: <winpcap-users at winpcap.org>
Sent: Tuesday, January 06, 2009 1:47 PM
Subject: [Winpcap-users] winpcap captures packet, but winsock doesn't see it

> Hello all.
> I have a strange problem and I was hoping someone could point me in the
> right direction.
> I have an issue where 2 IP endpoints are configured as and
> with subnet masks of  They are connected via a
> switch.  I'm not sure of the switch manufacturer.
> Device A (a WinXP PC running a Winsock application) sends a UDP broadcast 
> to
>  Device B (an embedded device) replies to that broadcast 
> with
> another broadcast to  Wireshark/Winpcap is running on the 
> PC.
> Wireshark captures the reply, but the reply doesn't get to the Winsock app
> running on Device A.  It's like the app just never received the packet 
> (i.e.
> recvfrom doesn't indicate that any data has been received).
> I'm unable to duplicate this behavior in my similar environment, so
> something tells me it's the PC in question or some other hardware issue
> (something with the NIC driver?).
> Regards,
> Coleman
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