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

[Gianluca Varenni]

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?

GV

----- 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 138.67.19.10 and
> 138.67.19.37 with subnet masks of 255.255.192.0.  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
> 138.67.63.255.  Device B (an embedded device) replies to that broadcast 
> with
> another broadcast to 138.67.63.255.  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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