[Winpcap-users] winpcap 4.0.2 possible packet loss?

[Tony Ballardie]

Some more information on this issue...

 

The function 'pcap_sendpacket' is failing up to 40% of the time when
sending the streaming multicast packets to the kernel.

 

Is this a known issue, and is there a fix??

 

Tony

 

 

From: winpcap-users-bounces at winpcap.org
[mailto:winpcap-users-bounces at winpcap.org] On Behalf Of Tony Ballardie
Sent: 10 October 2008 12:21
To: winpcap-users at winpcap.org
Subject: [Winpcap-users] winpcap 4.0.2 possible packet loss?

 

Hi,

 

Winpcap 4.0.2 is being used on a Windows Server 2008 box to capture
UDP-tunnelled streaming media (IP multicast) packets and then present
de-capsulated/original multicasts for playback in windows media player
on box. Depending on the stream, the bitrate may be 500-600kbps. 

 

The underlying multicast packets are being IP fragmented at source, so
each fragment is UDP-tunnelled so arrives as its own UDP packet,
becoming an IP fragment after tunnel decapsulation. 

 

I'm not the developer here but I'm presuming once the tunnelled packets
are decapsulated they are written back to NPF for subsequent
presentation to the IP layer and normal IP processing.

 

The on-box media player is showing up to 40% packet loss and wonder if
this could be due to the NPF not being capable somehow of processing
packets under these higher bitrate conditions? The path between source
and receiver is just a single-hop LAN and I'm confident the packet loss
is not happening in the network.

 

Or perhaps certain parameters need setting accordingly?

 

The network adapter is a Broadcom NetXtreme Gigabit Ethernet adapter.

 

Any suggestions would be greatly appreciated.

 

Thanks

 

Tony

 

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