[Winpcap-users] problem with WinPcap... stops working!

[Har Yash Bahadur]

Hi! All,

 

I have written a simple application using WinPcap to send and receive
L2-level (MAC) packets to a hardware device connected to my PC through
Ethernet. The details of the setup are as follows:

 

1.	The device runs software which sends back the packets received
through the RJ-45 cable. The device has an integrated VMAC and its MAC
address is known to the application running on PC beforehand.
2.	The host (Windows PC running XP) has a Network adaptor card and
its MAC address is known to the application.
3.	The Application on PC-host prepares L2 packets in the following
format:    | Dest MAC Addr | Src MAC addr | Protocol Type=0x88e1|
PAYLOAD |
4.	The application then uses WinPcap APIs to send and receive
packets to the hardware device; on a Request - Response basis.
5.	The host is not connected to any LAN. It has been assigned a
static IP, but it has other services running which keep sending out
queries as if the PC were on a LAN.

 

Problem Description:

1.	The packets which are sent out for the device are also received
by the handler registered with WinPcap. This was mitigated by putting a
filter in the handler using the protocol type (0x88e1) and the source
Mac address as criteria-so that application gets only those packets
which are SENT by the device to the PC.
2.	A bigger problem is that sometimes, after some "other" packets
are received (and duly rejected by the handler), the communication seems
to stop/hang. There is no crash as such, but the packet handler seems
stop working.

 

I am new to WinPcap; if you guys had a similar experience then please
give me some clues.  Thanks! 

 

Regards,

Har Yash

 

 


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