Hi, > Hi, > > I am going to do some video streaming experiments over wireless > networks. I try to get the corrupted video bitstream from network, but > the PPP and UDP checksum discard the corrupted packets. WinPcap can get > the packet before it is sent to upper layer protocols.In this case, > maybe I can get the corrupted packet from network. My questions are: > > (1)Does WinPcap support PPP with higher windows service pack?
No if winpcap is used upon the ndiswan MS driver. As Q6 http://winpcap.polito.it/misc/faq.htm states, the problem is in ndiswan rather than in winpcap. You have some chances to capture the packets if the adapter is emulated as an ethernet device (which I think is the usual case for most adapters). > (2)if the packet is corrupted before it is sent to PPP, can the > WinPcap pick up the corrupted packet? As far as I know, no. The corrupted layer 2 frames are usually discarded by the hardware or by the NIC driver. > (3)Can I get the packet as soon as it arrives the wireless card? Yes. Again, unless winpcap is used upon the ndiswan MS driver. In this case you will get nothing. > (4)Does WinPcap do some check sum while it decode PPP and UDP packet? No, it delivers all the packets it sees, without any processing. Loris > Thanks a lot for your early reply. > > Best wishes > > Yufeng > > The wireless card I will use is Sierra Wireless AirCard 555. > www.sierrawirelss.com > > >
